FW: pentosin substitutes revisited - verrrrrry interesting stuff

[james accordino]

You bring up some good points.  AFAIK, viscosity index
is the ability to flow at a given temp.  Higher flow
#'s are better.  You talked about flash points.
Higher temps. are definitely better.  The final point
is the key.  I wanted to say this before.  Every Audi
I've owned or worked on looked like 55 gallons of
waste oil was sprayed in the engine bay and then sand
was blasted on over that.  I was buying Pento. by the
case. (cheaper that way)  Phil kept harping on "fix
the leaks!".   Once I fixed all the leaks, I don't
think I've used a liter in 50k miles.  I'll go 10k
miles, and the line on the resivour hasn't moved.
That's the key.  "Fix the leaks!"

Jim Accordino

--- "Livolsi, Stephane"
<Stephane.Livolsi at investorsgroup.com> wrote:
>
> >     As far as your ZF info goes, they are saying
> that if you have central
> > hydraulics (e.g. brake assist/self levelling) then
> you need to be using
> > G002/Pentosin/whatever they call it round your
> way.
> >
> Actually, I was trying to point out that ZF does NOT
> specify G002/Pentosin
> which I found very curious.  I suspect that Audi
> chose Pentosin as a
> supplier and therefore specifies only G002 as
> acceptable, even though there
> may be other hydraulic oils out there that are safe
> to use in Audi systems.
> I actually think the wording would be something
> along the line of ' use only
> a fluid that meets or exceeds the specifications of
> Pentosin G002000"  So
> it's the specs that are important, not the brand.
> However, what I found was
> that it appears that G002000 actually is unique and
> there are no other oils
> that meet or exceed it's specifications.  Read on.
>
> I had a bit of time on my hands so I did a bit of
> comparison between a few
> hydraulic oils, combination hydraulic/tranny fluid,
> and pentosin CHF 7.1 and
> CHF 11S.  The 'other' oils include Chevron, Mobil,
> Amsoil and other less
> well known brands even getting into the Ford/New
> Holland and other tractor
> brands.  My search led me to the tractors because,
> as I found out, many of
> them use a common reservoir to supply hydraulic
> fluid to the wet clutch, wet
> brakes (however that works), transmission and the
> hydraulic system.  The
> comments on friction were particularily interesting
> which generally
> indicates that the tractor fluids should not be used
> in our systems.
> What I found was that many of them are very close to
> the pentosin specs
> EXCEPT in 2 categories - Viscosity Index and
> 'Viscosity at -40C'.  The
> viscosity index for 7.1 and 11S is 340 and 320
> respectively.  ALL of the
> other oils that I found that spec'd similar to
> pentosin had much lower
> numbers including Mobil DTE 13M.  The DTE comes in
> at 140.  Let me be
> honest, I DON'T KNOW WHAT THIS MEANS.  For all I
> know a lower number may be
> better.  Does anyone know?
>
> Also, the viscosity for DTE (as an example) at -40 C
> is 5110 whereas for
> pentosin it is listed at <1100.  Again, I don't know
> if this is good or bad.
>
> The flash point for 'other' oils tends to be 20-40
> degrees C above pentosin.
> This I suspect is good.
>
>
> Let's face it, if you have a good hydraulic system,
> the cost of pentosin
> shouldn't be an issue because you use so little of
> it (provided your system
> doesn't have the 'seive' option).  My reason for
> looking into this is
> availability (try asking for pentosin around here if
> you want people to look
> at you like you have 2 heads) and also potentially
> cheaper hydraulic system
> flushes.
>
> Just some food for thought
>
> Stephane
>
>
>


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