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#3445989 - 08/04/14 06:50 PM Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2
that_guy318 Offline


Registered: 08/04/14
Posts: 14
Loc: PA and SC
Ok, I've got a 99 Durango with the 5.2L (318) V8 and selectable 2wd/awd/4wd. It's got 168,000 miles on it right now. My parents bought it new and I've had it for the past 6 years and ~60k miles. My dad always changed the oil every 3,000-4,000 miles with Wolf's Head 10w30 and a bottle of STP. Since I've had it I've been using Castrol GTX High Mileage part synthetic 10w30 and a bottle of STP every 3,000 - 3,500 miles. I use Purolator or Mopar (made by Purolator) filters.

The motor doesn't have any leaks, smoke, etc... and still runs very strong. It does burn about 1 qt every 2,000 or so miles. I usually don't drive very hard, usually not going over 2,000 - 2,500 rpm, but every once it a while such as getting onto the highway I let it wind out. I'd say I have pretty much a 50/50 split of highway and in town driving other than when I'm travelling between PA and SC (getting 17-18mpg surprisingly).

The climate really varies because I spend parts of the year in Pittsburgh and the rest in SC. My air filter is a k&n oiled reusable one in the stock airbox.

Anyway, here's the oil report.




I'm no expert, but the way I read this it seems like there isn't much wear material in the oil. So any thoughts on the report and how well the oil is performing?
_________________________
-99 Durango 5.2L V8 178k miles
Castrol GTX High Mileage 10w30 with Purolator/Mopar filter every ~3,500 miles

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#3446026 - 08/04/14 07:15 PM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: that_guy318]
ThirdeYe Offline


Registered: 02/23/07
Posts: 8136
Loc: Grand Rapids, MI
STP will increase the viscosity of your oil, so I'm not surprised it's reading in the 40-grade range. The wear looks great, and it seems like your K&N isn't letting too much dirt through. Did you warm the car up fully before getting the sample? For best results (and to see if your engine really is dumping too much gas into the oil), make sure to get the oil up to operating temperature by taking it on a long trip beforehand. Welcome to BITOG!
_________________________
07 Honda Accord - 591k - Pennzoil Platinum HM 5W-20/Fram Ultra

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#3446040 - 08/04/14 07:27 PM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: that_guy318]
aquariuscsm Offline


Registered: 12/30/06
Posts: 16847
Loc: South Texas,USA
Instead of the STP,you should run an oci of GTX 10W40HM or 20W50HM and see what happens,but,if the STP has zinc/moly (or some other anti-wear stuff like I "think" I read here someplace?) it might be good for your high mileage engine. Your uoa looks great!
_________________________
1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Pennzoil Platinum 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Quaker State 0W20



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#3446041 - 08/04/14 07:28 PM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: that_guy318]
abycat Offline


Registered: 12/06/10
Posts: 2007
Loc: grande prairie AB
Looks good to me.
_________________________
2004 f350 6.0
2011 nissan versa hb

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#3446044 - 08/04/14 07:29 PM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: that_guy318]
that_guy318 Offline


Registered: 08/04/14
Posts: 14
Loc: PA and SC
I had drove to Wal-Mart and back getting the oil before I changed it and got the same if I'm remembering right, do about a 12 mile round trip. The coolant was up to temp, but I'm suspecting the oil might not have completely been. Supposedly it takes a good bit of time for the oil to fully warm up in these engines. Most of the trips I make any more than 15 miles or so, so I would suspect that explains the gas content in the oil.


The reason I've been using the STP is the added zinc. Would it be worth not having that anymore?


Edited by that_guy318 (08/04/14 07:34 PM)
_________________________
-99 Durango 5.2L V8 178k miles
Castrol GTX High Mileage 10w30 with Purolator/Mopar filter every ~3,500 miles

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#3446053 - 08/04/14 07:38 PM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: that_guy318]
Merkava_4 Offline


Registered: 01/30/07
Posts: 16999
Loc: Clovis, CA
The 10W-30 and the can of STP did very well for this engine.

A viscosity of 11.36 is a nice healthy viscosity at the upper end of the 10W-30 range.

I'd keep doing the same if it was me. thumbsup

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#3446063 - 08/04/14 07:47 PM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: that_guy318]
dnastrau Offline


Registered: 12/13/06
Posts: 405
Loc: PA
Greetings:

Just a few thoughts on your Durango:

I would skip the STP from now on - it really isn't needed with today's oils. Your engine seems to be wearing well and should do fine without it. Oil has come light years since additives like STP were developed. Any good 5W30/10W30 today should serve you well by itself.


The 5.2 and 5.9 Magnum engines commonly blow the lower intake plenum gasket and the lower cover also warps. When this happens, the engine sucks oil into the intake and burns it up. It can also cause spark knock. Perhaps your lower intake plenum cover is warped and/or the gasket is blown. This might account for the oil that you are burning. Here is a video that should be helpful:



I believe you can open the throttle plates and look into the intake to see if any oil is visible in there. If there is oil in there, you can bet the plenum is blown.

Some additional notes:

You probably have the 44RE transmission. If you haven't done it already, I would change the filter, adjust the bands and replace the fluid with ATF+4 fluid. A good stacked plate transmission cooler installed in series with the radiator cooler in the return line would be a good edition for longevity. If your Dodge has a check valve in the return line, it would be a good idea to remove it because these sometimes fail and cook the transmission.

Best wishes for many more miles on your 318.

Andrew S.


Edited by Bill in Utah (08/06/14 07:59 AM)
Edit Reason: embed the youtube to prevent from your post being removed.

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#3446070 - 08/04/14 07:56 PM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: that_guy318]
that_guy318 Offline


Registered: 08/04/14
Posts: 14
Loc: PA and SC
My dad said the dealer changed the plenum gasket years ago under warranty, so I don't think that's an issue. There's not oil or anything in the intake either. There's some oily residue coming from the crankcase breather into the air hat though. I just installed a catch can to see if it's a significant amount. I do plan on eventually getting one of the Mopar performance intakes that do away with the plenum pan though.

I do have the 44re transmission. I changed the filter and fluid a couple years back, didn't adjust the bands though. Adjusting them and adding a new transmission fluid cooler are on my list of things to do.


Edited by that_guy318 (08/04/14 08:03 PM)
_________________________
-99 Durango 5.2L V8 178k miles
Castrol GTX High Mileage 10w30 with Purolator/Mopar filter every ~3,500 miles

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#3446077 - 08/04/14 08:04 PM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: that_guy318]
ThirdeYe Offline


Registered: 02/23/07
Posts: 8136
Loc: Grand Rapids, MI
Originally Posted By: that_guy318
I had drove to Wal-Mart and back getting the oil before I changed it and got the same if I'm remembering right, do about a 12 mile round trip. The coolant was up to temp, but I'm suspecting the oil might not have completely been. Supposedly it takes a good bit of time for the oil to fully warm up in these engines. Most of the trips I make any more than 15 miles or so, so I would suspect that explains the gas content in the oil.


The reason I've been using the STP is the added zinc. Would it be worth not having that anymore?


Keep doing what you're doing, if you like using it. The engine is wearing great.
_________________________
07 Honda Accord - 591k - Pennzoil Platinum HM 5W-20/Fram Ultra

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#3446101 - 08/04/14 08:21 PM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: ThirdeYe]
aquariuscsm Offline


Registered: 12/30/06
Posts: 16847
Loc: South Texas,USA
Originally Posted By: ThirdeYe
Originally Posted By: that_guy318
I had drove to Wal-Mart and back getting the oil before I changed it and got the same if I'm remembering right, do about a 12 mile round trip. The coolant was up to temp, but I'm suspecting the oil might not have completely been. Supposedly it takes a good bit of time for the oil to fully warm up in these engines. Most of the trips I make any more than 15 miles or so, so I would suspect that explains the gas content in the oil.


The reason I've been using the STP is the added zinc. Would it be worth not having that anymore?


Keep doing what you're doing, if you like using it. The engine is wearing great.


^^This. Your uoa looks great! I'd just keep on keeping on.
_________________________
1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Pennzoil Platinum 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Quaker State 0W20



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#3446312 - 08/05/14 05:23 AM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: that_guy318]
FFeng7 Offline


Registered: 06/01/04
Posts: 354
Loc: Va
Was the STP additive just the standard blue bottle or was it the high mileage version?
_________________________
2002 Dakota Quad Cab 4x4-Supertech 5w30-Fram PH16 Filter
2007 Cobalt LT-Valvoline Maxlife 5w30-AC Delco Filter

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#3446426 - 08/05/14 08:29 AM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: that_guy318]
that_guy318 Offline


Registered: 08/04/14
Posts: 14
Loc: PA and SC
Just the blue bottle
_________________________
-99 Durango 5.2L V8 178k miles
Castrol GTX High Mileage 10w30 with Purolator/Mopar filter every ~3,500 miles

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#3446981 - 08/05/14 05:06 PM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: that_guy318]
FFeng7 Offline


Registered: 06/01/04
Posts: 354
Loc: Va
Thanks! The UOA is looking good with that stp.
_________________________
2002 Dakota Quad Cab 4x4-Supertech 5w30-Fram PH16 Filter
2007 Cobalt LT-Valvoline Maxlife 5w30-AC Delco Filter

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#3447602 - 08/06/14 08:07 AM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: that_guy318]
KCJeep Offline


Registered: 06/30/11
Posts: 6858
Loc: Mahzurrah!
Thanks for posting! I have long wondered what a UOA with STP in the crank would look like, even considered doing one myself but got distracted with other experiments.
_________________________
04 Jeep Grand Cherokee 4.0 145k - GTX 5w30/10w40
09 Lincoln MKZ AWD 84k - Magnatec 5w30
12 KIA Sedona 80k - Edge 0w40
09 Ford Focus 125k - QSUD 5w30

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#3448692 - 08/07/14 09:35 AM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: that_guy318]
that_guy318 Offline


Registered: 08/04/14
Posts: 14
Loc: PA and SC
Yeah, it seems like the stp is working. I'm kind of surprised that there wasn't more zinc showing up on the report though. I'm going to keep using it though, it's worked for years, so why change it.

My grandpap said that he took the heads off of his 83 Pontiac with the 305 and 130k miles (the distributor got water in it, made it backfire, and screwed up something that I forgot the specifics of), and the original honing marks were still there, there was no lip at the top at all and the positions came right out. His rebuilder measured it and there was less than a thousandth of an inch of wear only at the bottom of the cylinder. He always ran stp in it since he bought it with less than 10k miles.
_________________________
-99 Durango 5.2L V8 178k miles
Castrol GTX High Mileage 10w30 with Purolator/Mopar filter every ~3,500 miles

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#3448801 - 08/07/14 12:02 PM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: that_guy318]
KCJeep Offline


Registered: 06/30/11
Posts: 6858
Loc: Mahzurrah!
Blue bottle STP does have zinc, but less than the motor oil you are adding it to. It is primarily an oil thickener. I still have a soft spot for it though. No oil change was complete without a can of STP when I was a teen. Have used it in the Jeep fairly recently and it did seem to like it, the Jeep does favor thicker oils though.

Great UOA I wouldn't change a thing it's obviously working for you.
_________________________
04 Jeep Grand Cherokee 4.0 145k - GTX 5w30/10w40
09 Lincoln MKZ AWD 84k - Magnatec 5w30
12 KIA Sedona 80k - Edge 0w40
09 Ford Focus 125k - QSUD 5w30

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#3449215 - 08/07/14 08:15 PM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: that_guy318]
that_guy318 Offline


Registered: 08/04/14
Posts: 14
Loc: PA and SC
I think my engine likes the thicker oil too. I have right under 40lbs of pressure at idle and right under 60 or so at cruising speed.
_________________________
-99 Durango 5.2L V8 178k miles
Castrol GTX High Mileage 10w30 with Purolator/Mopar filter every ~3,500 miles

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#3449401 - 08/08/14 02:47 AM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: that_guy318]
Garak Offline


Registered: 12/05/09
Posts: 22535
Loc: Regina, Saskatchewan, Canada
Originally Posted By: that_guy318
Yeah, it seems like the stp is working. I'm kind of surprised that there wasn't more zinc showing up on the report though. I'm going to keep using it though, it's worked for years, so why change it.

Somewhere in the VOA section, I did the calculations to show that regular STP will actually dilute the zinc content of most motor oils. It's worse than useless as a ZDDP additive.
_________________________
Plain, simple Garak.

2008 Infiniti G37 coupe - Mobil Delvac 1 ESP 5w-40, Wix 57356
1984 F-150 4.9L six - Quaker State GB 10w-30, Wix 51515

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#3451974 - 08/10/14 09:42 PM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: Garak]
that_guy318 Offline


Registered: 08/04/14
Posts: 14
Loc: PA and SC
Originally Posted By: Garak
Originally Posted By: that_guy318
Yeah, it seems like the stp is working. I'm kind of surprised that there wasn't more zinc showing up on the report though. I'm going to keep using it though, it's worked for years, so why change it.

Somewhere in the VOA section, I did the calculations to show that regular STP will actually dilute the zinc content of most motor oils. It's worse than useless as a ZDDP additive.


It looks like it increased the zinc content of my oil though. http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1414695
_________________________
-99 Durango 5.2L V8 178k miles
Castrol GTX High Mileage 10w30 with Purolator/Mopar filter every ~3,500 miles

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#3452063 - 08/11/14 01:31 AM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: that_guy318]
Garak Offline


Registered: 12/05/09
Posts: 22535
Loc: Regina, Saskatchewan, Canada
Perhaps, if the original ZDDP content was low enough, of course. For most oils, it's certainly not true.
_________________________
Plain, simple Garak.

2008 Infiniti G37 coupe - Mobil Delvac 1 ESP 5w-40, Wix 57356
1984 F-150 4.9L six - Quaker State GB 10w-30, Wix 51515

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#3457997 - 08/17/14 01:16 PM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: that_guy318]
2KBMW Offline


Registered: 10/29/03
Posts: 536
Loc: Ontario Canada
[quote=that_guy318]Yeah, it seems like the stp is working. I'm kind of surprised that there wasn't more zinc showing up on the report though. I'm going to keep using it though, it's worked for years, so why change it.

I'm also surprised that the viscosity was that low or stayed in the 30 weight range. I thought that STP raised the viscosity by two grades ie. a 30 weight oil would turn into a 50 weight. The report said it was a 40 weight though so do you think there was an error made ?

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#3458355 - 08/18/14 12:14 AM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: 2KBMW]
that_guy318 Offline


Registered: 08/04/14
Posts: 14
Loc: PA and SC
Originally Posted By: 2KBMW


I'm also surprised that the viscosity was that low or stayed in the 30 weight range. I thought that STP raised the viscosity by two grades ie. a 30 weight oil would turn into a 50 weight. The report said it was a 40 weight though so do you think there was an error made ?


I really don't know enough about this to say one way or the other.
_________________________
-99 Durango 5.2L V8 178k miles
Castrol GTX High Mileage 10w30 with Purolator/Mopar filter every ~3,500 miles

Top
#3459086 - 08/18/14 09:03 PM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: 2KBMW]
artificialist Offline


Registered: 09/23/07
Posts: 8440
Loc: Florida
Originally Posted By: 2KBMW
[quote=that_guy318]Yeah, it seems like the stp is working. I'm kind of surprised that there wasn't more zinc showing up on the report though. I'm going to keep using it though, it's worked for years, so why change it.

I'm also surprised that the viscosity was that low or stayed in the 30 weight range. I thought that STP raised the viscosity by two grades ie. a 30 weight oil would turn into a 50 weight. The report said it was a 40 weight though so do you think there was an error made ?

Well, what ratio of STP to 10w30 engine oil? If the sump is big, the thickening effect of 1 bottle of STP might not be very big.

The second thing to consider is oil shear. How much did the 10w30 oil shear, and how much did the STP shear? Enough shearing, and an oil will go down a viscosity grade, making a 10w40 into a 10w30 and so on.

My dad told me that in the 1960s, guys used STP because they thought it was the cool thing to do. Back then, it may have made sense, due to the limited detergent content of 1960s engine oil, and because not all oils had high ZDDP.
_________________________
2010 Lancer Ralliart Sportback

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#3470772 - 09/01/14 11:18 AM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: artificialist]
that_guy318 Offline


Registered: 08/04/14
Posts: 14
Loc: PA and SC
Originally Posted By: artificialist
Originally Posted By: 2KBMW
[quote=that_guy318]Yeah, it seems like the stp is working. I'm kind of surprised that there wasn't more zinc showing up on the report though. I'm going to keep using it though, it's worked for years, so why change it.

I'm also surprised that the viscosity was that low or stayed in the 30 weight range. I thought that STP raised the viscosity by two grades ie. a 30 weight oil would turn into a 50 weight. The report said it was a 40 weight though so do you think there was an error made ?

Well, what ratio of STP to 10w30 engine oil? If the sump is big, the thickening effect of 1 bottle of STP might not be very big.

The second thing to consider is oil shear. How much did the 10w30 oil shear, and how much did the STP shear? Enough shearing, and an oil will go down a viscosity grade, making a 10w40 into a 10w30 and so on.

My dad told me that in the 1960s, guys used STP because they thought it was the cool thing to do. Back then, it may have made sense, due to the limited detergent content of 1960s engine oil, and because not all oils had high ZDDP.


About 4.5 quarts of oil and 1 bottle (I think it's about a pint) of stp.
_________________________
-99 Durango 5.2L V8 178k miles
Castrol GTX High Mileage 10w30 with Purolator/Mopar filter every ~3,500 miles

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#3526082 - 10/31/14 12:45 PM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: that_guy318]
84zmyfavorite Offline


Registered: 07/14/10
Posts: 712
Loc: Wenatchee, W.A.
Both my 1985 Jeep Grand Wagoneers 360 and my 1993 Jeep Grand Cherokees 5.2Liter 318 recieved a bottle of STP Blue bottle at their last oil change. Glad to see others having good results with it as well. I wear my STP Teeshirt when changing oil as well!

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#3534478 - 11/10/14 09:11 AM Re: Castrol GTX HM 10w30 +STP/3,300mi/99 Durango 5.2 [Re: 84zmyfavorite]
that_guy318 Offline


Registered: 08/04/14
Posts: 14
Loc: PA and SC
Sounds like I need to get one of those shirts
_________________________
-99 Durango 5.2L V8 178k miles
Castrol GTX High Mileage 10w30 with Purolator/Mopar filter every ~3,500 miles

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#3833107 - 08/25/15 05:39 PM Valvoline HM 10w30 +STP/2,628mi/99 Durango 5.2 [Re: that_guy318]
that_guy318 Offline


Registered: 08/04/14
Posts: 14
Loc: PA and SC
Not sure if putting this in the old thread is the thing to do or not, so mods can move this if they want.

Anyway had another oil analysis done recently. Oil had been in the car for almost 6 months this time, so it got changed a bit sooner. Used Valvoline 10w30 high mileage this time along with a mopar (purolator) filter. The wear looks more or less the same to me as it did with the castrol last time.




Also thought I'd mention that I changed the trans fluid, did a band adjustment, and replaced the radiator with one with an auxiliary external trans cooler since someone had mentioned it before.
_________________________
-99 Durango 5.2L V8 178k miles
Castrol GTX High Mileage 10w30 with Purolator/Mopar filter every ~3,500 miles

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#3833310 - 08/25/15 09:22 PM Re: Valvoline HM 10w30 +STP/2,628mi/99 Durango 5.2 [Re: that_guy318]
KCJeep Offline


Registered: 06/30/11
Posts: 6858
Loc: Mahzurrah!
Both look great. No STP this time?
_________________________
04 Jeep Grand Cherokee 4.0 145k - GTX 5w30/10w40
09 Lincoln MKZ AWD 84k - Magnatec 5w30
12 KIA Sedona 80k - Edge 0w40
09 Ford Focus 125k - QSUD 5w30

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#3834556 - 08/26/15 09:48 PM Re: Valvoline HM 10w30 +STP/2,628mi/99 Durango 5.2 [Re: that_guy318]
that_guy318 Offline


Registered: 08/04/14
Posts: 14
Loc: PA and SC
Still used STP. I think only 3/4 of a bottle though. Used the other 1/4 bottle on something else. Still using the same k&n air filter too.


Edited by that_guy318 (08/26/15 09:52 PM)
_________________________
-99 Durango 5.2L V8 178k miles
Castrol GTX High Mileage 10w30 with Purolator/Mopar filter every ~3,500 miles

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