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Message: <blockquote data-quote="Keith McElroy" data-source="post: 577794" data-attributes="member: 63212">I think it is really based on the type of driving you do.  I have seen a Ford F150 with 375,000 miles have an engine that looks pristine because the owner changed the oil every 3,000 miles, as well as a Rolls Royce with over 1,000,000 miles (complete with manufacturer certification badge to prove it) that looked pristince because of 4,000 mile intervals.  On the flip side, I worked on a ford mustang that had grooves in the cam (and a broken cam follower) because the owner changed the oil at 10,000 miles and drove mostly city.  If you drive highway, you can usually get by with a longer oil change intervals, but if you drive in the city or tow with it, you had better do it sooner.As far as oil weight goes, I got bit one year because I decided to use a SAE 30 oil that was on sale instead of the 10W30 in a 4-cylinder.  Worked great until the temperature dropped, then the starter did not have enough power to turn the engine over.  In the northern states, the recommended is best.</blockquote>