Don't extend the intervals. I don't remember the exact numbers, but for motor oil to be sold and labeled as "synthetic blend", it needs a very, very low percentage of actual synthetic in it. In other words, don't buy synthetic blend.
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Originally Posted by Intercooled T
Full synthetic is also like $7/quart @ NAPA, DO NOT BUY THAT CRAP
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Are you saying synthetic oil is not worth it?