Folks,
>From a guy who has seen many pieces of turbomachinery
torndown after operating under the same conditions,
the bearings oiled with synthetic last 2 to 3 times as
long as conventional, and look a helluva lot brighter.
That said, I use Castrol GTX (non-synth) in the Bugeye
;-) (I did have a leak increase when I had the 948,
and it got REAL expensive).
I do use synth in the 110,000 mile bimmer that is
still faster than the day it was driven out of the
showroom.
--- Jeff Boatright <jboatri@emory.edu> wrote:
> Yes, about $4 per qt. I have no justification for
> this expense other than
> the _slight_ increases in the numbers as given below
> and that a local
> rebuilder suggested strongly that I try it. This is
> the guy who keeps about
> 30 Jensen-Healeys on the road in the Altanta metro
> area.
>
> Of course, quick math tells you that at 29 mpg,
> you'll burn 103.5 gallons
> over a 3000 mile oil change interval, which works
> out to $124.20 at $1.20
> per gallon. At 33 mpg, you'll spend $109.10, giving
> a $15.10 savings when
> using synthetic vs regular oil. If you assume that
> Castrol GTX is $1.00 per
> qt, and IF you don't burn or leak a lot of oil,
> you'll spend about 4 qts x
> $4 = $16 on Valvoline synthetic and about $4 total
> on Castrol GTX, for a
> loss of $12 over the 3000 mile oil change interval.
> Adding gas savings and
> oil loss gives a total savings of $15.10 - $12 =
> $3.10 when using the
> synthetic vs GTX. In reality, I probably burn and
> leak that savings over
> 3000 miles. But, at least I don't eat the whole cost
> differential between
> synthetic and regular oil.
>
> I have not completed my study of whether I'm having
> to add more or less
> synthetic per 1000 miles than regular oil. I expect
> to have those figures
> by the end of summer (the mileage tests were done
> over the course about
> about 20 tanks of gas). So far, I'd say there is no
> gross difference. I
> bring this up because many people have stated that
> they developed a lot of
> oil leaks when they switched to synthetic oil. I
> have not found this to be
> true for me on a gross scale, anyway.
>
> I have fun monitoring this stuff. But please note
> that switching to
> synthetic oil may give no benefit in YOUR car in
> terms of mileage. Even
> without mileage savings, a $12 loss every 3000 miles
> doesn't seem like much
> to me, given that I enjoy playing around with this
> stuff. OTOH, some folks
> enjoy the challenge of running cars as cheaply as
> possible. I can
> understand that different kind of fun, and that
> going synthetic may not be
> fun for them. It's all a big spridgetly world.
>
> TTFN,
>
> Jeff
>
> At 3:53 PM -0400 8/12/99, Ulix Goettsch wrote:
> > Hi Jeff,
> > is it expensive?
> > Ulix
> >
> >
> >
> > On Thu, 12 Aug 1999, Jeff Boatright wrote:
> >
> > > I'm using Valvoline 20w50 full synthetic in my
> 1275 cc BMC A-series engine.
> > > I find that it gives me slightly higher oil
> pressure compared to Castrol
> > > GTX 20w50 when hot (190+ F) - about a 3 psi
> increase at 900 rpm idle. When
> > > I switched, my idle went from 900 to 1200 rpm
> (since reset, of course) and
> > > the mileage jumped from 29 to 33 mpg.
> > >
> > > I make no claims about the stuff - I'm not in
> love with it, I'm not
> > > sentimental about it, I have no ego invested in
> it, I'm just reporting what
> > > I found.
> > >
> > > YMMV,
> > >
> > > Jeff
> > >
> > >
> > >
> > > Jeffrey H. Boatright, PhD
> > > Senior Editor, Molecular Vision
> > > http://www.molvis.org/molvis
> > > Mailto:jboatri@emory.edu
> > > 404-778-4113
> > >
> > >
> > >
> >
> > Ulix
> __/__,__ ___/__|__
> >
>
..............................................(_o____o_)....<_O_____O_/...
> > http://students.washington.edu/~ulix/ '67
> Sprite '74 X1/9
>
>
>
>
> Jeffrey H. Boatright, PhD
> Senior Editor, Molecular Vision
> http://www.molvis.org/molvis
> Mailto:jboatri@emory.edu
> 404-778-4113
>
>
>
>
Bid and sell for free at http://auctions.yahoo.com
|