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#3331050 - 04/02/14 06:55 AM What straight wt oil to try for 2000 RHD Cherokee
Raye7r Offline


Registered: 02/09/09
Posts: 11
Loc: Indiana
Have a 2000 RHD Cherokee (200K miles) that got hot on mail route and oil pressure went away (this was a few years back,radiator blew). Been getting by with 15 40 Synthetic in winter, regular 15 40 in summer. In both cases a bottle of STP added. The oil light has started to come on at idle after it is warm. Some one suggested going to a straight weight. Don't want to start thin and waste it. Don't want to go too thick to begin with. Whats your best guess on the weight I should try first. Thanks.

It is used as a back up vehicle now so not driven all the time. The oil light started coming on this winter.


Edited by Bill in Utah (04/02/14 08:52 AM)
Edit Reason: Changed subject to be more useful in search

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#3331065 - 04/02/14 07:18 AM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
Astro14 Offline


Registered: 10/10/10
Posts: 4682
Loc: Virginia Beach
If the oil light is coming on with 15W40 in it, no monograde/straight weight short of a 50 is going to make any difference. At operating temp, a 15W40 and a monograde 40 are just about the same. I think the advice that you received is uninformed...

So, best guess? Try something like the Valvoline racing 50 for a monograde...but it's going to be awful trying to get it started in cold weather...I think your best bet is to bump up to a 20W50 multigrade...any brand will do...easier starts, slightly higher viscosity than the 15W40 you're running.

It's worth putting a known/calibrated oil pressure gauge on this when it's hot...would be nice to know what your actual pressure is...instead of trusting the idiot light. Given the age/history, your bearings are likely very worn...and nothing short of a rebuild is going to fix this permanently.


Edited by Astro14 (04/02/14 07:23 AM)
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#3331109 - 04/02/14 07:47 AM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
Plumber Offline


Registered: 10/23/13
Posts: 146
Loc: Northern Illinois
Try the 20w50

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#3331123 - 04/02/14 07:55 AM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
Zaedock Offline


Registered: 09/10/05
Posts: 3852
Loc: Massachusetts
200K? Verify the sending unit and oil pressure with a mechanical gauge. If low, replace the oil pump.

It's $60-$70 and you can upgrade oil pan gaskets to the one piece as well (rear main is right there too). I did one on a New Hampshire house call on the ground in winter. It took me 4 hours.

If you're not interested in looking into it/repairing correctly, as I suspect because it happened a few years ago, then just drive it. SAE50 might help in summer, but is a silly bandaid IMO, as lubrication will suffer just to keep an idiot light off.
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#3331147 - 04/02/14 08:15 AM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
armos Offline


Registered: 06/21/11
Posts: 208
Loc: California
I agree that you need to verify the problem. Electric oil pressure senders are not trustworthy. Even new ones are sometimes inaccurate. A mechanical gauge should be used to verify what the pressure really is when the light is coming on.

If that's not an option, and you have to trust the sender, then at least make sure you're using the proper OEM spec sender (Mopar or whatever label they use now. I've had major accuracy problems with knockoff brands on GMs anyway). But if you can, a mechanical measurement is 100x more meaningful than any replacement sender.

Assuming the pressure problem is real, then I'd suggest 20w50 to nurse it along, and be easy on it. If it starts knocking, it's done and the damage will accelerate quickly. In that event definitely stop driving it until you can get it rebuilt.
Also consider the possibility that the previous overheating may have blown a head gasket (maybe worse, especially if it's an aluminum head). There could be slow contamination that's thinning the oil.

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#3331149 - 04/02/14 08:17 AM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
spasm3 Offline


Registered: 05/30/10
Posts: 4183
Loc: out there
As Zaedock and armos have suggested, you may be fixing a problem that does not exitst. Your pressure may be fine, at that mileage replace the sender.
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#3331157 - 04/02/14 08:22 AM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: armos]
Zaedock Offline


Registered: 09/10/05
Posts: 3852
Loc: Massachusetts
Originally Posted By: armos
If that's not an option, and you have to trust the sender, then at least make sure you're using the proper OEM spec sender (Mopar or whatever label they use now. I've had major accuracy problems with knockoff brands on GMs anyway). But if you can, a mechanical measurement is 100x more meaningful than any replacement sender.


Yeah, forgot to mention this ^^^

In my experience, cheap replacement sending units are just that, cheap!
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2012 F150 Ex-cab 5.0L/2004 Malibu Maxx LT
1992 YJ "The Heep"/1994 Olds Cutlass Ciera 3.1/auto
1975 Ford Bronco/1959 Willys CJ5/20XX Custom rock crawler

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#3331165 - 04/02/14 08:32 AM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
LargeCarManX2 Offline


Registered: 09/23/06
Posts: 2279
Loc: Up here in the NorthWest
Chevron Delo 400 30w and add a can of STP

or

Amsoil 60w motorcycle oil
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#3331173 - 04/02/14 08:37 AM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: LargeCarManX2]
Zaedock Offline


Registered: 09/10/05
Posts: 3852
Loc: Massachusetts
Originally Posted By: LargeCarManX2
Chevron Delo 400 30w and add a can of STP

or

Amsoil 60w motorcycle oil


I had a lot of Delo SAE30 and 15W40 from the '05 sale. The SAE30 is on par with a 15W40 when cold and is 12.1cST @ 100*C when hot, thinner than the 15W40.

I also wouldn't put Amsoil anything into this engine $$. Supertech all the way!
_________________________
2012 F150 Ex-cab 5.0L/2004 Malibu Maxx LT
1992 YJ "The Heep"/1994 Olds Cutlass Ciera 3.1/auto
1975 Ford Bronco/1959 Willys CJ5/20XX Custom rock crawler

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#3331188 - 04/02/14 08:54 AM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
Chris142 Offline


Registered: 06/05/03
Posts: 11758
Loc: apple valley, ca
20w50 if the oil pressure is actully low.
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#3331213 - 04/02/14 09:16 AM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
Miller88 Offline


Registered: 04/09/08
Posts: 7177
Loc: Onondaga County
Check with a mechanical gauge.

If it's really low - why not stick another engine in it?
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#3331239 - 04/02/14 09:46 AM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
Donald Offline


Registered: 03/21/04
Posts: 13765
Loc: Upstate NY
I agree you need to find out if its really low oil pressure with a mechanical gauge. But given your scenario it certainly may be. Certainly an oil pump is worth trying.

After that I think you are looking at a rebuild. Does it also burn oil?
_________________________
2001 Jeep Grand Cherokee Laredo 4.0 - PP & M1
1999 Dodge Ram 2500 w/Cummins - Rotella T6 & M1
Amsoil ATF in both vehicles & Magnefine filter.

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#3331240 - 04/02/14 09:47 AM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
Stelth Offline


Registered: 02/24/11
Posts: 1485
Loc: California
If I were trying to nurse along such a vehicle, I'd see if I could get some Penrite HPR30 20w-60. According to Penrite, it's available in the US, and should give better cold-start performance than a heavy straight grade.
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#3331245 - 04/02/14 09:53 AM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
threeputtpar Offline


Registered: 08/04/11
Posts: 1650
Loc: Appleton, WI
NAPA has their house brand 15W-50 on sale for $3.69/quart this month. Stock up.
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2013 Honda Odyssey Touring Elite - QSUD 5W-30 and Bosch 3323 (living on the edge!)
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#3331252 - 04/02/14 10:03 AM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
michaelluscher Online   content


Registered: 10/07/12
Posts: 1485
Loc: Staten Italy
First, actually check oil pressure with mechanical gauge, or replace the cheap sender.
If pressures good, replace sender.
Then, move on to the oil pump. Under $100 including refreshing several gaskets.
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#3331390 - 04/02/14 01:03 PM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
Papa Bear Offline


Registered: 08/11/05
Posts: 6162
Loc: Leamington, ON, Canada ..... r...
Originally Posted By: Raye7r
The oil light started coming on this winter.


Does it knock? Is it running OK?

If it's running alright then leave it alone and drive on.
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2007 Uplander LS RWB .. ST dino, NAPA Pro-Select filter (quite sufficient)


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#3331536 - 04/02/14 03:51 PM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
Raye7r Offline


Registered: 02/09/09
Posts: 11
Loc: Indiana
I'v changed the sender twice, it has a gauge also. Will have checked with mechanical gauge. Light just started coming on. Mail delivery vehicle so has a ton of idling time on it (5 hours to a hundred miles). Just called my NAPA and told them to bill me for a case of 15w50. No rattles, even when light on. Rattles good on startup though. Been a good one. You think new oil pump will help if pressure low.

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#3331582 - 04/02/14 04:57 PM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
eljefino Offline


Registered: 06/15/03
Posts: 24664
Loc: ME
You guys are on the wrong track with the right idea. wink

OP needs to either pull his thermostat or put in a 150-160 degree one. This will thicken up the oil more than going up a grade. Those jeeps have a mechanical and electric fan, IMO. Wire up the electric to be always on.

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#3331675 - 04/02/14 07:01 PM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
bullwinkle Offline


Registered: 10/09/04
Posts: 4230
Loc: Cincinnati, OH, USA
20W50 and a can or two of STP will raise it-but verifying actual low oil pressure would be a smart move.
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#3332068 - 04/03/14 08:51 AM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
rslifkin Offline


Registered: 06/27/10
Posts: 2238
Loc: Stamford, CT / Rochester, NY
On a 2000, the head probably cracked when it got hot (0331 head). Has it been losing coolant? If so, the bearings in the bottom end are probably shot if it's got low oil pressure, as the coolant has likely wiped them out.

If the oil isn't milky, no slime under the oil cap and it hasn't been losing coolant, then verify the pressure with a mech gauge and replace the oil pump if it's actually low (worn out oil pumps aren't uncommon on high mileage 4.0s).


Edited by rslifkin (04/03/14 08:52 AM)
_________________________
1998 Jeep Grand Cherokee 5.9 Limited with Heads/Cam/Headers/Exhaust/Tune/Shift Kit/Suspension Work (178k miles, bought with 100k)
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#3332125 - 04/03/14 09:42 AM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: rslifkin]
jeepman3071 Offline


Registered: 04/15/10
Posts: 1837
Loc: Storrs, Connecticut
Originally Posted By: rslifkin
On a 2000, the head probably cracked when it got hot (0331 head). Has it been losing coolant? If so, the bearings in the bottom end are probably shot if it's got low oil pressure, as the coolant has likely wiped them out.

If the oil isn't milky, no slime under the oil cap and it hasn't been losing coolant, then verify the pressure with a mech gauge and replace the oil pump if it's actually low (worn out oil pumps aren't uncommon on high mileage 4.0s).


This. thumbsup
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2000 Jeep Cherokee Sport 4.0L (148k) - 5 qts PYB 5w30 + 1 qt PP 5w30, Napa Silver 31085, Magnefine trans filter

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#3332273 - 04/03/14 12:36 PM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
Miller88 Offline


Registered: 04/09/08
Posts: 7177
Loc: Onondaga County
A lot of times, 4.0s will run hot enough to evaporate the coolant so you don't end up with the milk on the oil cap ... even with a cracked head.
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#3332280 - 04/03/14 12:42 PM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Miller88]
rslifkin Offline


Registered: 06/27/10
Posts: 2238
Loc: Stamford, CT / Rochester, NY
Originally Posted By: Miller88
A lot of times, 4.0s will run hot enough to evaporate the coolant so you don't end up with the milk on the oil cap ... even with a cracked head.


Huh. When my mom's cracked the head, it had almost a 1/2" of slime under the valve cover and on the oil cap and valvetrain after a couple hundred miles (she noticed it losing coolant, I checked it out and found it before any lasting damage was done). It took forever to clean it all up before reassembly.
_________________________
1998 Jeep Grand Cherokee 5.9 Limited with Heads/Cam/Headers/Exhaust/Tune/Shift Kit/Suspension Work (178k miles, bought with 100k)
Rotella T6 @ 6k OCI

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#3332443 - 04/03/14 03:15 PM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
Donald Offline


Registered: 03/21/04
Posts: 13765
Loc: Upstate NY
Have you changed the oil filter since the light started to come on? If not that would be the first thing to do.

I had a 1994 Camry where the oil light would come on. Mechanical gauge confirmed oil pressure issues. Changed only the filter (Amsoil) and problem went away. Amsoil evaluated the filter and said the filter was full, but not defective. So unknown problem with a top quality filter.

Put on another 100K miles and never any more issues.
_________________________
2001 Jeep Grand Cherokee Laredo 4.0 - PP & M1
1999 Dodge Ram 2500 w/Cummins - Rotella T6 & M1
Amsoil ATF in both vehicles & Magnefine filter.

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#3332806 - 04/03/14 09:54 PM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
artificialist Offline


Registered: 09/23/07
Posts: 7043
Loc: Florida
If you really need an SAE40, you can probably get it at a marina because many boats still have a Detroit Diesel 2-cycle engine which needs SAE40.

I wouldn't use STP, approved oil already has the additives that are needed.
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#3333343 - 04/04/14 02:27 PM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
circuitsmith Offline


Registered: 12/17/09
Posts: 165
Loc: Wash, DC
If it's not the sender it's most likely worn main crank bearings causing low pressure at idle.
How many of you saying change the oil pump have actually seen a high mileage & low pressure problem fixed with a new pump?
The pump is low, closest to the sump so it's the last part to get starved of oil.
Normally it's constantly bathed in the oil at its coolest.
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2006 Toyota Matrix 5-sp. 1zz-fe 5000mi/12mo OCI
Any major brand dino 5w-30 on sale

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#3333467 - 04/04/14 04:42 PM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
andyd Offline


Registered: 09/25/04
Posts: 3898
Loc: Marshfield , MA
The rattle on cold start up. Thats a worn thrust bearing on the crank. It prolly has a few miles left.But it is showing wear. I would switch to 20 w 50. I use it down to 10F in my cars which are specced for it.
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