Question about 1987 Cadillac Brougham

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Changing engine oil types from 10w30 to 5w30

I have a 1987 305 chevy with 140,000 miles on it.The former owner used 10w30 but the oil cap says use 5w30.Should I change it to the 5w-30 or is it too late or cause any damage??

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If anything i would bump it up to a 10w40 with that kind of milage engine is prety loose, just stick with the same brand of oil just go heaver, i'am not a big fan of 5w30 to me its like pouring water in the crankcase.

Posted on Feb 21, 2009

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Will not cause any problems,you can use either without any negitive effects.

Posted on Feb 21, 2009

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