How many miles before oil change

[the_vetman]

Well, the most "scientific" way to figure this out may be doing oil analysis after each oil change. Ideal change interval could depend on your car, driving style, whether you track, condition of the engine, etc., etc.

Porsche may recommend 10,000-20,000 miles between each change but many recommend doing it every 5,000 miles. Oil is cheap; your engine is not. However, some call this a waste based on oil analyses. YMMV.

If you track your car, changing more frequently than 5,000 miles is often recommended.