Fw: [Vwdiesel] Amsoil

Nate Wall natewall1 at yahoo.com
Wed Jul 23 07:23:58 EDT 2003

Hey, if you listen to the Jiffy Lube folks, they say
that the additives/oil wears out (begins to) after
three months. If mileage is low, they say its
indicative of short trips (usually???). Marketing
hype, I think.

I had a novel idea for oil change intervals: Base it
on fuel consumption. Summer highway driving change
intervals should be the longest, and fuel economy is
greatest here. Winter driving fuel economy is less,
and stop and go driving (severe use), well, we all
know about the mileage you get w/ that. What do you
all think?

--- Dana Morphew <kadm at pugetsound.net> wrote:
> Why does oil have a time-determined change interval
> in addition to the
> mileage/kilo interval?  I have a hunch that either
> the anti-oxidants are
> presumed to be exhausted after X amount of time, or
> the acid formation
> from moisture condensing in the sump has depleted
> the anti-acid
> additives in "such and such" amount of time.  Does
> anyone know for sure
> though?  If I've driven my vehicle 1500 miles in six
> months of "normal"
> driving, all trips being long enough to thoroughly
> heat the Delo 400
> 15w40 oil and evaporate any water that was present,
> and only one trip,
> 60 miles long, made each week, are the respective
> additives going to be
> too low to safely continue using the oil for another
> 6 months when I'll
> have 3000 miles and one year on the oil? During this
> hypothetical case,
> 1/2 quart was added every 750 miles.
> Dana
> Gerry Wolfe wrote:
> >
> > Oil doesn't really wear out.
> >
> > It does pick up a bunch of
> byproducts-of-combustion that can create some
> > ugly acids etc. that are offset/neutralized by the
> additive packages.  I can
> > see where overdoses of additives can  counteract
> this to allow for longer
> > drain intervals, and periodic testing can identify
> when these neutralizers
> > have been used up.
> >
> > With a diesel, we also have soot being added to
> the oil.  I suspect these
> > are relatively inert, but they are solids.  Unless
> there were a bypass
> > filter, or unless you changed the main filter
> regularly, these would
> > increase over time and no amount of additional
> additives or testing would
> > remove them.  They can't be good for lubrication.
> >
> > For that reason, I stick with a 15w40
> diesel-specific (cheal) dino oil such
> > as a Rotella and change regularly instead of using
> a more expensive synth
> > changed less regularly.
> > >   Generally when Amsoil recommendes the long
> interval for oil change they
> > > recommend using their bypass filter.  They don't
> (or didn't anyway)
> > recommend
> > >
> > > the really long intervals without it.
> > >      Loren
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