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Car maunfacturers state 5k between changes. Oil companies state 3k.
they both have something to gain from you taking their advice. Car makers = shorter life
Oil Makers = buy more oil.
Most people agree that you can run synth oil about 7,000 miles.
I listen to what the diesel VW crowd says. Diesels' engine oil gets dirty fast.
there are diesel VW guys who use synth and change only the filters twice as frequently. They claim they can make their oil good for 15,000 miles. They might buy the most expensive synth oil and change their filter every 3,000 miles.
I've never done it, but it makes sense if you are buy $10 a quart oil.
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