1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Motor Oil?

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Old 11-14-2003, 04:36 AM
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Anybody here try Royal Purple?
Old 11-14-2003, 02:49 PM
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Mobil 1 syn. nuff said!!
Old 11-16-2003, 11:58 PM
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quaker state full syn.
nuff said


hehehe i love Quaker state
Old 11-17-2003, 10:02 AM
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For me:
Whatever is left in my Dad'* garage!!!
Old 11-17-2003, 12:21 PM
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Originally Posted by Justind23
I've heard the same thing about fullsyn being bad for seals as well. Something about the oil running thinner than normal oil or something like that. I won't say I understand what that'* all about but I've used a blend in my cars to be on the safe side and it'* worked out well.


Full synthetic keeps things clean. A high milage engine has "sludge"built up and sometimes that "sludge" is keeping it from leaking. When you put full synthetic into a high milage engine that has always used conventional oil you will have leaks. It isnt that synthetic actually damages the seals.

I and the previous owner of the engine has always used Castrol synthetic 10w30
Old 11-17-2003, 01:11 PM
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Originally Posted by Fiero3800sc
Full synthetic keeps things clean. A high milage engine has "sludge"built up and sometimes that "sludge" is keeping it from leaking. When you put full synthetic into a high milage engine that has always used conventional oil you will have leaks. It isnt that synthetic actually damages the seals.
Your example is for an engine that has not had its oil (dino or syn) changed reularly. IMO, An original owner of a car that uses ANY API Detergent Oil, will keep that enginge clean WITHOUT Any "sludge" build up regardless of the amount of mileage one has on their engine, providing that the oil & filter were chagned at regular intervals(preferably around 3000 miles). I am NOT disputing that Synthetic Oils are better for ones engine. I am just saying that if you change your dino oil and filter regularly, you will probably never see any sludge build up on that engine. If it leaks with syn, it will leak with dino(except your engine with "crud" additives or maybe those "hi mileage" oils that are said to swell the seals).
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