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You don't. Assembly lube should be used on cams, rocker arms, lifters, springs, etc, but not on cranks or main bearings. Assmebly lube is a high pressure lubricant used for initial start up and break in. It will clog the oil galleys on the crank, and may even give false readings when torquing the mains back down. Motor oil will be just fine, more specifically, 5w30 or 10w30 and convential, not synthetic oil should be used.

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Q: Where do you put assembly lube on main bearing when installing?
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