I'm a general manager for Jiffy Lube, we're owned by Pennzoil. They put us all through a class taught by their own chemists and engineers. Here's what they taught us. Synthertic oil does not break down for 25,000 miles. Your oil filter only filters inpurities for about 3000. After that it just flows through. You can get away with going 4-5000 but that is pushing is because after that filter stops filtering that 25,000 gets cut down drastically. I change mine every 3000.
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