(01-06-2011, 02:34 PM)Mystake Wrote: ive heard as little as 3 months for conventional oil.
personally I just run synthetic. The other thing is, you can't switch back and forth from synthetic to conventional. it doesn't work that way.
but synthetic does not break down over time.
says who? I switched from regular to synth to regular again now. been on regular for a year and when I switched to synth I did it for a year of pure castrol goodnes. now I settle with whatever oil type substance meineke put in my car. and nothing bad has happened.