Big Poppa T

If you happen to understand german this canister says "ol fur zentral- hydraulische systeme" under that it says "niveauregulierung . hydropnematische Federung . dampfung" then " Servolenkung Einsatzbereich: -40 / +130 degrees celcius" then " spezicil fur kalte lander geeignet." right under the pentosin label are large letters "CHF 11s"
it is made by rolls royce and bentley part no:rh 5000 I was told to use this for power steering fluid it is some kinf of minereal oil
ANY OPINOINS ON USING THIS AS A POWER STEERING FLUID
the mech who prescribed this stuff has a very good reputation as a porsche mechanic and is the 928 specialist at Norden Autohaus (the local dealership)
Thanx Guys Sorry So Long

hacker-pschorr

Required on most Audi's for the power steering. If you use anything else in those systems, kiss it goodbuy.

I don't see why the opposite wouldn't also be true. If the 928 setup wasn't designed for it, I wouldn't use it.

RyanPerrella

I used that in my 1995 BMW M5, it was used for the power steering and for the self leveling rear suspension which runs off the PS pump. Its the recommended fluid for some BMW and mercedes models, but why would you want to use it in a 928, for one its not the specified fluid, 2 its between $15-$25 a liter. Stick with dexron

Mark Anderson

I can tell you that it is the recomended fluid on the factory Porsche race cars using the electric power steering so I use it in my 928 race car which has the same pump.

RyanPerrella

actually this reminds me to ask about my PS FLuid,

MArk, maybe you may know, I replaced the rubber lines to and from the reservior and replaced the reservior and added redline Dexron II to the system. But when i ran the engine and it was pumped through the system it became milky, and went from a red color to a watermelon color is the best way to describe it.

anyone else had sililiar experience? I'm wondering if i need to flush it already

hacker-pschorr

Now this sounds like a cool conversion. It would be worth every penny to relocate the PS lines away from my cam towers that made it a bitch to remove the lower cam tower bolts.

Big Poppa T,
Fluch your system, fill with the new stuff - let us know what happens

Mark Anderson

It sounds like the fluid is just airated but it should look normal after it settles down.

Mark Anderson

I located my pump where the passenger seat is. I wanted to get the pump off the engine and shift weight back.

dr bob

What Mark said, plus--

There are some directives from Ford that suggest that their PS system should be de-aerated using a vacuum pump. Air in the PS system affects steering performace. For the Ford folks, de-arerating the fluid gets rid of some nasty pump screaming and moaning. I'm not sure that my 928 has ever made an PS noise once the fluid has de-aerated itself over the course of a few days of driving anyway. It seems that, at least with the Dexron, the bubbles will find their little way to the top of the reservoir on their own, if left alone. It will still take a few days of use to get all the bubbles out.

RyanPerrella

Yeah i had kinda hoped that was the case, still i couldnt find an explination why it did it, but then again the lines had been dry and open for the past 3 months so i assume its the air being sucked through the lines along with the fluid.

JP Rodkey

P/S fluids can be tricky. Most of us old enough to have messed with vintage 70's and 80's American cars just used good ol' transmission fluid with no problmes at all - simple pumps for simple systems. In a prior life, I asked a chemist at Conoco about the "real" difference between P/S fluid and tranny fluid. He went into an extended dissertation - with the bottom line that they are quite different, not the least based on the additives used to give them the characteristics required.

I have a Saab, which ONLY recommends Pentosin CHF 11S and the warranty will be voided if anything else is used. CHF is a general hydraulic fluid designed specifically with properties for hydraulic systems. Some OEM's design their pumps, valves, etc. to perform with CHF criteria. It may well be possible that there are other substitutes out there, but I'm not interested in experimenting. Pentosin sells around $20/liter.

sweanders

Pentosin is the preferred PS for the 993 but I don't know if it is good to run it in a 928. Probably best to run what is known to work and recommended from the factory.

There is a Swede building a turbo 928 who has located his electric PS pump up by the firewall on the passenger side. Looks like a good place to put it.

MBMB

My 6.9 took Pentosin in the hydropneumatic suspension. -Sigh- nostalgia.

hacker-pschorr

Not sure Lorelei would enjoy that setup.....then again.

wds928

I bought a quart from the local MBZ dealer and use is for the self-leveling system in my '92 500E. I use Dextron III for the p/s in the 500E and the 928 GTS.