Re: castrol vs. valvoline

["Ron Soave" <redlotus@spacey.net>]

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> I find that Marvel Mystery Oil also increases pressure. The can says it
> increases viscosity of crankcase oils, and it apparently does, but I
don't
> understand why. 

It looks, smells, feels, and has the detergent properties of automatic
transmission fluid.  The detergent aspect could clean out "orifices" to
help oil pressure, but it does seem to have a more immediate effect. 
Something must be a little different, though.  Whatever.