Valvoline VR-1 vs. Lucas Hot Rod oil

davescuda said
If you have a motor with tight bearing clearance. I don't think you want to run thicker oil like 20w50
I was just wounding the 10w30 oil. What clearance your bearing should be?
I see people set up motors from .0015 to .0030. Just wondering if you are on the tight side or if you are the loser side of clearance does the weight of the oil matter?
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I'm not certain where I stand on it. I've run pretty much 10/30 exclusively in all my older stuff and never had issues. That includes some race stuff with full grove mains and .003" clearance. I'm sure there's some merit to it, but I've never had any trouble.