How long does it take to have the bearings and cam broken in before I can start using synthetic oil?

 

A paper included with my zz430 clone from salle chevrolet said No synthetic for the first 1000 miles

 

I dunno, Vettes with the LS1 came off the lots with Mobil 1 in them. I put it in my truck when it only had like 400 miles on it. Three years later, the engine purrs like a kitten. You can't hardly even hear it idle once it's warmed up, just sits there at 500RPM and doesn't vibrate or anything. Now if I could say the same for my IROC.... .

 

I think that I will try 1000 to 1500 miles or so before switching to Synthetic oil. Thanks alot.

 

Basically, the first oil change, which should be 500-1000 miles. The factory sends roller motors out with synthetic in them; flat tappet motors however should have dinosaur juice for the first few hours of operation.

The bearings don't really have to break in; it's mostly the cam & lifter contact area that determines this.

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