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Motor Oil for High-Mileage engines

908 Views 5 Replies 5 Participants Last post by  HIGH ROLLER
My sbc 350 is a mild build, probably around 300 give or take hp. Don't know without a dyno and other than tearing it completely apart for specifics I don't have any history or knowledge of what's in it. Heads are 1.94/1.50. Not pleased with that but it is what it is.

My question is would it be prudent to start running with motor oils made for high mileage engines? Casting # indicates a 77-79 Monte Carlo/Caprice engine, and I'm assuming it's got some miles on it. No, it doesn't burn an ounce (when running).
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No there not making good oil for older motors, find the old oil and you will be fine, problem is its not made anymore, i'm not saying you guys need racing oil, but the additive levels of the older oil which you won't find anymore, i don't care what they say SM grade oil is junk.
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