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Re: 454 question: Should I be worried about the reliability of my motor?
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Originally Posted by 61Chevy454
Might be dumb, but in every older motor I don't know the history of, I always run 15W-40 because I just don't know the history.
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It's not so thick it's going to hurt any older Chevy powerplant and isn't a bad starting point, but after you get a feel for the engine and have determined it doesn't make any noises or give other feedback that indicates excessive wear stepping down to 10w30 isn't a bad thing, either. If oil pressure stays good and no noises start up, it'll only help it - thinner oil gets around the engine quicker, reduces drag, and carries heat away from parts better. Our trucks' owners manuals all say 10w30 can be used year-round, and while oil quality has improved substantially in the last 30-40 years, the viscosity scale hasn't changed.
15w40 is a truck oil - a diesel truck oil. Our trucks can survive on anything from 5w30 to 20w50 or even straight 30, but all the pre-LS Chevy V8's I've owned or been around for many miles show no complaint with 10/30's and 10/40's.
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Alex V.
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1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs.
1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue.
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