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#4527404 - 09/27/17 09:22 AM Synthetic Blend help with consumption?
Mossyoakglock Offline


Registered: 06/12/09
Posts: 101
Loc: Nashville, TN, United States
I have a 2008 Silverado w/ 5.3 and slight oil consumption issues (like most of them). Would running Pennzoil 5w-30 Syn Blend help with consumption at all? If I ready the PDS right it looks like it is a little thicker at temp than the full synthetic. Would there be any benefit to running a blend over a full synthetic? Truck has 125,000 on it.

The synthetic cSt @ 40 is 10.3 and the blend is 11.
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2008 Chevrolet Silverado
5.3L / 4L60E

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#4527413 - 09/27/17 09:29 AM Re: Synthetic Blend help with consumption? [Re: Mossyoakglock]
pbm Offline


Registered: 04/19/04
Posts: 7600
Loc: New York
It could go either way...it could consume more, less or the same using syn-blend. I'd try a High Mileage oil, rather than a syn-blend, to see if the seal conditioners help....
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#4527417 - 09/27/17 09:34 AM Re: Synthetic Blend help with consumption? [Re: Mossyoakglock]
Chris142 Offline


Registered: 06/05/03
Posts: 16818
Loc: Deplorable in apple valley, ca
How many miles per qt is it using?
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#4527443 - 09/27/17 10:14 AM Re: Synthetic Blend help with consumption? [Re: Mossyoakglock]
ZZman Online   content


Registered: 03/17/08
Posts: 5778
Loc: Michigan
What is slight consumption? Many manufacturers consider some consumption normal.
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2003 Mercury Grand Marquis. Rotella T6 Multi-Vehicle oil
2008 Sebring Hardtop convertible. Rotella T6 Multi-Vehicle oil
2006 Kawasaki Vulcan 900 LT. Amsoil Metric 10w-40

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#4527446 - 09/27/17 10:18 AM Re: Synthetic Blend help with consumption? [Re: Mossyoakglock]
ZZman Online   content


Registered: 03/17/08
Posts: 5778
Loc: Michigan
Bad PCV valve?
Worn valve guides?
Sticking rings?
Hard to say if it will help or not.
_________________________
2003 Mercury Grand Marquis. Rotella T6 Multi-Vehicle oil
2008 Sebring Hardtop convertible. Rotella T6 Multi-Vehicle oil
2006 Kawasaki Vulcan 900 LT. Amsoil Metric 10w-40

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#4527454 - 09/27/17 10:30 AM Re: Synthetic Blend help with consumption? [Re: Mossyoakglock]
dogememe Offline


Registered: 04/15/17
Posts: 597
Loc: SF BAY AREA, CA
Have you tried using an AFM Range Disable?? https://rangetechnology.com/afm-disabler/

From what I'm heard the AFM/DOD system is responsible for most problems with these engines including oil consumption.
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2007 Ford Crown Vic P71 4.6 ~124K Miles, Valvoline SynPower 5W-30, Royal Purple Filter *Daily Driver*
2010 Ford Escape 2.5 ~70K Miles, Valvoline SynPower 5W-30, Wix Filter *Turo Rental Car*

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#4527473 - 09/27/17 10:59 AM Re: Synthetic Blend help with consumption? [Re: Mossyoakglock]
dwendt44 Offline


Registered: 05/17/06
Posts: 3968
Loc: Central Wisconsin
You could try a 10W-30 oil and see if that helps.
Tennessee doesn't get that cold in winter, not likely to
see single digits on the thermometer.


My 2
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#4527526 - 09/27/17 11:54 AM Re: Synthetic Blend help with consumption? [Re: Mossyoakglock]
Alex_V Offline


Registered: 04/10/16
Posts: 1155
Loc: Campbellsville, KY
I've put Valvoline Maxlife 10w30 in several LS-powered trucks and tens of thousands of miles later (not on the same OCI laugh ) they're still doing just fine. I wouldn't hesitate at all to put in something along those lines and see how it does.
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#4527590 - 09/27/17 01:08 PM Re: Synthetic Blend help with consumption? [Re: Mossyoakglock]
LeakySeals Offline


Registered: 02/18/11
Posts: 6568
Loc: Hudson, NH
Tell us about prior maintenance. Oil changed on time? What kind of oil was used? Knowing that, perhaps a synthetic clean up may help with stuck rings. If the engine is clean and all oil changes were done on time I would try replacing the valve cover with built in PCV. Go read about it in the Amazon reviews some claim it completely stopped.
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06 Escalade 6.0L AWD 160k. M1 5w30 Fram TG
03 Maxima 3.5L 149k ST HM 10w30

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#4527672 - 09/27/17 03:02 PM Re: Synthetic Blend help with consumption? [Re: Mossyoakglock]
Mossyoakglock Offline


Registered: 06/12/09
Posts: 101
Loc: Nashville, TN, United States
To answer all questions at once:

How many miles per qt is it using? - not exactly sure. I check it regularly so not sure how much it's using per 1,000 miles. I'd say around a quart (maybe less).

Have you tried using an AFM Range Disable?? https://rangetechnology.com/afm-disabler/ - I was using the Range but the truck would randomly go back to V4 mode so I ditch it. I went with a tuner and disabled it that way. I didn't do it until around 60K miles so the damage was probably already done at that point.

Tell us about prior maintenance. Oil changed on time? What kind of oil was used? Knowing that, perhaps a synthetic clean up may help with stuck rings. If the engine is clean and all oil changes were done on time I would try replacing the valve cover with built in PCV. Go read about it in the Amazon reviews some claim it completely stopped - Oil always changed based on OLM (maybe a little before or a little after) but usually around the 6,000 mile mark. Always used Synthetic. Used M1 for the first 2-3 years then went with PP. Tried Valvoline but truck didn't like it. Now using M1 Extended. I also replaced the valve cover with the updated cover based on the GM TSB.

I thought about going with a HM oil (most likely Pennzoil) but not sure if I want to because I've never read a definite answer that you can or cannot go back to non-HM after using it.

Also, after thinking about it would it really make a difference between an 10w and 5w since they are both the same at operating temps? Also, we can get into the low 10's and even in he singles here during the winter (which we have the last few years). We just don't get the snow.


Edited by Mossyoakglock (09/27/17 03:13 PM)
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2008 Chevrolet Silverado
5.3L / 4L60E

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#4527702 - 09/27/17 04:02 PM Re: Synthetic Blend help with consumption? [Re: Mossyoakglock]
FZ1 Offline


Registered: 02/07/08
Posts: 4727
Loc: Texas
Worth a try.

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#4527706 - 09/27/17 04:08 PM Re: Synthetic Blend help with consumption? [Re: Mossyoakglock]
SatinSilver Offline


Registered: 01/24/08
Posts: 10150
Loc: OH
Seems as though you like Pennzoil so why not use some Pennzoil conventional oil in it? It's full of additives for cleaning and maybe the best thing for it. I'd just skip over the syn-blend and go right to the conventional. And this is coming from someone that runs full syn in one car and a syn-blend in the other.

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#4527714 - 09/27/17 04:17 PM Re: Synthetic Blend help with consumption? [Re: SatinSilver]
FZ1 Offline


Registered: 02/07/08
Posts: 4727
Loc: Texas
Good idea.

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#4528043 - 09/28/17 12:13 AM Re: Synthetic Blend help with consumption? [Re: Mossyoakglock]
Mossyoakglock Offline


Registered: 06/12/09
Posts: 101
Loc: Nashville, TN, United States
Because I don't know the ins and outs of oil specifications, properties, etc and I'm just curious. What would be the reason to try conventional over synthetic? Better cleaning and seal conditioners over synthetic?
_________________________
2008 Chevrolet Silverado
5.3L / 4L60E

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#4528208 - 09/28/17 08:19 AM Re: Synthetic Blend help with consumption? [Re: Mossyoakglock]
LeakySeals Offline


Registered: 02/18/11
Posts: 6568
Loc: Hudson, NH
I have the 6.0L. Using M1 5w30 I "lose" 1/4-1/3 qt during a 6500 OLM OCI. I say lose because it doesn't seem like I'm consuming it necessarily but the area around the oil pan and filter seems to be wet. I recently tried Edge black bottle and saw no drop on the stick, none. And it remained dry underneath. So it would seem like M1 finds way out of engine beyond standard consumption. so I guess the first test would be changing synthetics. See if that makes a difference. if changing synthetics makes no difference after a couple of oil changes then go the high mileage route. High mileage oil can help with tired rubber seals throughout the engine

I stay with M1 and the slight consumption because of butt Dino smoothness during the OCI. Starts getting a little sluggish and rough with other brands like Pennzoil and Castrol. Again that's just butt Dino personal preference with this particular engine.
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06 Escalade 6.0L AWD 160k. M1 5w30 Fram TG
03 Maxima 3.5L 149k ST HM 10w30

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