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[email]jrunruh@gmail.com[/email] wrote:[color=blue]
>
> also, totally unrelated.
> synthetic oil. what's the deal! my step dad said i could go 15,000
> miles in between changes.[/color]

Mobil 1 synthetic has an extended performance blend that they claim is
good for 15,000 miles. It is not the same as standard Mobil 1
synthetic.
[color=blue]
> i have gone 7,500 and i changed it. the same
> dude at jiffy scam said that i was insane and no one can go that long
> in between oil changes. who is right? is it bad to go 15,000 in between
> changes, when using mobil 1 or whatever?[/color]

You can read the stuff at the Mobil 1 web site and also see discussions
at [url]www.bobistheoilguy.com[/url]
[color=blue]
>From what I've read and my own experience, synthetic oil should be good[/color]
for 10,000 miles in new cars if most of those miles are on the highway
during trips long enough that the engine is fully warmed up. Short
trips in cold weather is murder on engine oil. Older engines may
require more frequent oil changes if previous owners were lax about
maintenance. I've been using synthetic oil in my cars for over 15 years
and am convinced the additional expense for the oil is repaid many
times over.

Rather than ignore your car like most folks, it is important to
routinely check your engine oil level, especially if you use an
extended oil change interval.