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What would be considered too late to switch to synthetic. I was under the impression that the ISF used synthetic from the factory, but when I had the dealer do my 10,000 mile service yesterday, they put in conventional. Would switching to synthetic at my 15,000 mile oil change be too late? Thanks in advance.
 

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What is the benefit of switching over to synthetic earlier than later then? Does the engine break in with tighter tolerances or something?
 
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