Personally, I don't think it makes an ounce of difference either way. The most important thing is just performing routine oil changes, period. I can see the arguments for both approaches. If you drain the oil after the engine has been warmed up, the contaminants may indeed be suspended more evenly in the oil, but less of that oil is in the oil pan to be drained. In contrast, if you wait overnight, most of the oil is down in the pan, but contaminant suspension is less.
I think it's a wash either way. Just change your oil and filter regularly and enjoy the ride.
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1966 Pontiac GTO ( restoration thread)
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