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#4653297 - 02/01/18 03:48 PM Maxlife - still the best oil for R/M seal leaks?
RonRonnster Offline


Registered: 12/06/17
Posts: 39
Loc: Idaho
A friend of mine picked up a '94 GMC Suburban with the TBI 350. Weeps a little bit from the rear main seal. I suggested he try Valvoline Maxlife to see if that helps slow it down at all - also couldn't hurt with 184k miles on the engine. After reading some threads here, and on other sites, many people are commenting that Maxlife doesn't work as well as it used to. Of course, no real data to back that up, but it does appear that Valvoline changed it's formula to meet Dexos Gen 2 specs. Is there a "better" high mileage oil out there than Maxlife these days for rear main leaks? I have run FS Maxlife in my '98 Chevy, but it hasn't been a leaker to speak of.

Other high mileage options that are easily attainable at WalMart:

Mobil 1 High Mileage
Pennzoil High Mileage
Castrol GTX High Mileage
SuperTech High Mileage

Any experience or anecdotal evidence that any of these work better the another for seal leaks?
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- 2007 GMC Yukon XL Denali - 6.2L / 81k mi.
- 1998 Chev K1500 4x4 - 5.7L / 155k mi.

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#4653308 - 02/01/18 03:57 PM Re: Maxlife - still the best oil for R/M seal leaks? [Re: RonRonnster]
FordBroncoVWJeta Online   content


Registered: 04/16/16
Posts: 769
Loc: KS
Originally Posted By: RonRonnster
A friend of mine picked up a '94 GMC Suburban with the TBI 350. Weeps a little bit from the rear main seal. I suggested he try Valvoline Maxlife to see if that helps slow it down at all - also couldn't hurt with 184k miles on the engine. After reading some threads here, and on other sites, many people are commenting that Maxlife doesn't work as well as it used to. Of course, no real data to back that up, but it does appear that Valvoline changed it's formula to meet Dexos Gen 2 specs. Is there a "better" high mileage oil out there than Maxlife these days for rear main leaks? I have run FS Maxlife in my '98 Chevy, but it hasn't been a leaker to speak of.

Other high mileage options that are easily attainable at WalMart:

Mobil 1 High Mileage
Pennzoil High Mileage
Castrol GTX High Mileage
SuperTech High Mileage

Any experience or anecdotal evidence that any of these work better the another for seal leaks?
I think the reason maxlife doesn't work like its use to because its now a semi synthetic. I started putting PHM in my sunfire, stopped leaking and cut down on burning.
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#4653310 - 02/01/18 03:58 PM Re: Maxlife - still the best oil for R/M seal leaks? [Re: RonRonnster]
JC1 Offline


Registered: 11/29/08
Posts: 3009
Loc: Oshawa, Ontario Canada
I've never had a rear main seal leak, so I cannot comment on any oils totally effectiveness at stopping that sort of leak.

Many here are very happy with maxlife. I'd say he try that first and see what happens.

I had some leaks on my 97 civic and 98 Sienna. I used liqui moly motor oil saver and had good results.
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#4653337 - 02/01/18 04:30 PM Re: Maxlife - still the best oil for R/M seal leaks? [Re: RonRonnster]
maverickfhs Offline


Registered: 12/28/16
Posts: 2001
Loc: VA
Subscribed...
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#4653341 - 02/01/18 04:38 PM Re: Maxlife - still the best oil for R/M seal leaks? [Re: RonRonnster]
SHOPete Offline


Registered: 12/15/05
Posts: 85
Loc: Martha's Vineyard MA
I was a skeptic on HM oils until I put PZHM in a leaky Ford Windstar V6. A miracle drug. Completely dried up a soaked motor. If I needed it, I'd use it again for sure. Can't comment on MaxLife.
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#4653358 - 02/01/18 04:55 PM Re: Maxlife - still the best oil for R/M seal leaks? [Re: SHOPete]
krismoriah72 Offline


Registered: 02/16/09
Posts: 1518
Loc: wv
I do not endorse these products..just have seen the bottles.





Edited by krismoriah72 (02/01/18 04:57 PM)

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#4653362 - 02/01/18 05:04 PM Re: Maxlife - still the best oil for R/M seal leaks? [Re: RonRonnster]
lawrencerd Offline


Registered: 07/03/13
Posts: 116
Loc: NC
I can honestly say Maxlife dried up a leak very well in my Jeep, since using QS HM it is a leaker again. Not a huge amount but that is one data point. Good luck with your friend's leak.

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#4653369 - 02/01/18 05:14 PM Re: Maxlife - still the best oil for R/M seal leaks? [Re: RonRonnster]
oil_film_movies Offline


Registered: 06/13/16
Posts: 2569
Loc: MN
Valvoline MaxLife does not swell the seals, an important distinction. We know it doesn't swell the seals much because it passes seal-swell tests in SN, and dexos1 for the full syn Maxlife. Maxlife conditions the seals. Conditioning may stop a small leak, as the seals would get more flexible, yet for something old already leaking, I'd definitely put in something like krismoriah72's Bar's or Blue Devil. See above post.

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#4653370 - 02/01/18 05:17 PM Re: Maxlife - still the best oil for R/M seal leaks? [Re: RonRonnster]
Reddy45 Online   shocked


Registered: 08/15/08
Posts: 2971
Loc: USA
Every 'fix in a bottle' I've tried worked initially and then stopped working some time later.

Even AutoRX was able to temporarily stop a leaking RMS, but the leak returned on the next oil change.

ATP 205 slowed the leak, but didn't stop it.

High mileage oil temporarily stoped the leak, but it returned later.


I'd leave it or pony up the money or sweat equity to replace the entire seal.

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#4653374 - 02/01/18 05:32 PM Re: Maxlife - still the best oil for R/M seal leaks? [Re: krismoriah72]
car51 Offline


Registered: 03/12/15
Posts: 10257
Loc: Southwest PA
Originally Posted By: krismoriah72
I do endorse these products..just have seen the bottles.





Fix d this for you smile


Edited by car51 (02/01/18 05:32 PM)
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#4653393 - 02/01/18 06:01 PM Re: Maxlife - still the best oil for R/M seal leaks? [Re: RonRonnster]
Chris142 Online   content


Registered: 06/05/03
Posts: 16824
Loc: Deplorable in apple valley, ca
Maxlife worked to stop the RMS leak my Jeep had. Smitty's Super-S Completely stopped the leaks and oil burning the wife's Tahoe had.
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#4653398 - 02/01/18 06:06 PM Re: Maxlife - still the best oil for R/M seal leaks? [Re: RonRonnster]
4WD Online   confused


Registered: 09/21/10
Posts: 6400
Loc: Texas
Dripping or wicking (engine famous for later) Mobil 1 10w30 High Mileage is a tad thicker with having to go 40s

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#4653414 - 02/01/18 06:29 PM Re: Maxlife - still the best oil for R/M seal leaks? [Re: SHOPete]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
Originally Posted By: SHOPete
I was a skeptic on HM oils until I put PZ HM in a leaky Ford Windstar V6. A miracle drug. Completely dried up a soaked motor. If I needed it, I'd use it again for sure. Can't comment on MaxLife.


I concur, I think the Pennz and Qkr St oils are similar packages,
and the high mileage products work very well on leaky rear crankshaft seals.
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(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4653424 - 02/01/18 06:52 PM Re: Maxlife - still the best oil for R/M seal leaks? [Re: RonRonnster]
fdcg27 Offline


Registered: 09/25/09
Posts: 15702
Loc: OH
Maxlife red bottle would be my first choice although M1 HM seems to work as well. The main rap I have on Maxlife is that the newer formulations no longer have any moly content.
The Maxlife is cheaper OTS but the M1 will be cheaper AMIR if you wait a couple of months for one of their MIRs.
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#4653460 - 02/01/18 07:47 PM Re: Maxlife - still the best oil for R/M seal leaks? [Re: RonRonnster]
SatinSilver Offline


Registered: 01/24/08
Posts: 10172
Loc: OH
Maxlife Red bottle and probably the 5w30 variant. Don't bother with M1 for this problem.

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