Posted by INCase on November 09, 2012 at 09:21:47 from (209.221.240.193):
In Reply to: % oil life vs. miles posted by Greenfrog on November 09, 2012 at 05:52:04:
well, as others mentioned the computer can't figure that out with any accuracy. its just an estimate based on miles and your driving patterns, idleing ect
% really depends on alot of things. Most importantly the quality of oil. Just because it has the API rating doesn't mean its the same as the others. all oils are NOT created equal. FOr example oil additives to control acid are the key item in oil life. Premium synthetics may be up around 12 TBN. Lower grade oils may by 6-8 TBN. HUGE difference in % life of oil. Also depends on the engine. A newer engine is less likely to contaminate the oil as fast as a well worn engine.
I'd change it where you're comfortable. Many new cars have 7-8000 change recomendations.
I run AMSOIL synthetics in my cars and change about once a year. SOme cars run about 10000/year some run up to 25000.
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