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Break-in oil: usage and availability

7.4K views 61 replies 26 participants last post by  BMF  
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30w might be okay in cool weather, but 20w/50 will give better heat protection and new rebuilt engines generate a lot of heat.
 
I always do the first heat cycle on the stand. Four minutes should be about right. Put a fan directed on the engine. Definitely keep the revs above 2K to splash lubricate the cam. Don't let it idle. I've never used any additional valve clearance.