Quote:
Originally posted by stevey_frac
and a q? why would any grand am use heavier than 10w-30 oil? the thinner oil will provide much better start up and still provide the same protection! i've even read of one case where the thicker oil CAUSED damage because it could not properly penetrate between engine internals!
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Supposedly 10w-30 is used in a 5w-30 engine when the mileage is high, which is when seals and stuff need to be leak-proofed after wear and tear; or so I've heard.
From Castrol's Site (the GTX HileMileage Oil Which I Use):
-Contains seal conditioners that provide added level of protection and help reduce leakage.
-Reduced deposit formation to minimize compression loss and maximize engine performance.
Not sure about the "heavier than 10w-30."