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Discussion Starter · #1 ·
Hey guys - They are getting ready to fire my new motor today (new short block), and I plan on running synthetic in it. The shop however, is telling me NOT to run synthetic in it for the break in (1000 miles). Is this correct ??? I mean lots of new cars come from the factory with Mobil 1. Any hlep would be appreciated.

Luke
 

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Yea lots of new cars come with it, after the engine has been run in on propane and regular oil in the engine shop. Typical run in is 1-12 hours depending on the manufacture.
 
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