Quote:
Originally Posted by E300D
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.
|
Auto manufacturers have nothing to gain by recommending an oil change interval greater than optimal. The company would have a bad reputation for making cars that don't last, and besides, those that purchase new cars don't keep them until the engine dies. Instead the car is sold used to someone else, and a new car is purchased again.
I go 12,000 miles between oil changes and don't change my filter either. I see no reason why it would clog to the point of the bypass valve opening. Is there any evidence to suggest filters clog shortly after 3,000 miles on a typical engine?