Motor Oil?
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
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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.
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