I change my oil in my bikes every 2,000 miles, which is about every 3 months, I change my oil in my cars when my change oil light pops on in my pontiac and when vehicle information center in my jeep tells me its time for service. which is every 5k miles on that. But I drive both of them mostly on highways and I end up changing them about once a month. once every one in a half month if I get lucky.
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