One thing I failed to mention.
A good indicator of how dirty the crankcase is on your engine is to
remove the valve covers and take a look.
Oil coloration on the cylinder heads under the valve covers that look
like tea stains is normal at 50,000 miles.
The crankcase will have ten times this amount of buildup and the
underside of your pistons will be holding a good bit of pure carbon that
will processed out by cleaning or the Mobil 1 oil.

Stan Wilder

On Tue, 8 Oct 2002 08:41:29 -0700 Joseph Fortino <love2bike140@YAHOO.COM>
writes:
> Hello and Good morning,
>
> Anyone have good results using Mobil oil?, currently
> I'm running this in my bus. * and what real effects of
> changing the oil type to and from another brand has an
> effect on the motor. ( if any )
>
> Thanks,
> Joe
>
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