CaptainGSR

I did a complete power steering flush, and I also replaced the PS reservoir on my early 95.
I am guessing my car was originally filled with ATF at the factory. The stuff that came out was all red. I used Pentosin CHF202 (green stuff.)
My steering wheel is definitely slightly harder to turn since the fluid replacement...
Has anyone else experienced this?

Is an old ATF equivalent available anywhere? I know that it was superseded by the CHF 202, but the steering feel is definitely different now...

rlme36

You probably have some left in the rack. I would hazard a guess that the two fluids are not compatible. Why did you change if you were orig filled with ATF?

rlme36

Oh and ATF is red in when new in the bottle

JM993

The fluids are compatible. You may want ensure the fluid level is correct.

CaptainGSR

I have the correct level, and it was a complete flush with the engine running, turning the steering wheel from stop to stop a bunch of times.
I switched to the CHF202, because it seemed to be a more stable product, and I was not sure which ATF to use...
Does anyone have the part number for the original ATF?

mpruden

Per this official Pentosin tech guide, the very small print says " Pentosin CHF fluids should not be mixed with ATF fluids"

Then the Streather book says that CHF and ATF can be mixed.

Gotta love conflicting information. I believe the Internet version, because if you find it on the Internet, it must be true.

JM993

The Porsche Workshop Manuals state that CHF and ATF are miscible i.e. can be mixed. In my experience, mixing has not presented a problem.

P-daddy

Same here. I've flushed with Pentosin 202 and all is well.

CaptainGSR

Just to update this thread...
After driving the 993 for a few months, with different sets of wheels, and at various tire pressure settings, I can report that the steering is just fine.
I had a Porsche specialist drive it and he also thought the steering was perfect...
I am sticking with the CHF202.

AZ Targa

There is a Porsche service bulletin on the matter, it says that CHF 202 can be added to top off the original ATF fluid, and should be used to fill in the future.

I don't like the idea of mixing fluids but that's my own opinion.

Edit: this is the quote from Checking and assembly operation on the power steering system 48 - 4 (1996)

"Porsche Started to fill the brake system with Pentosin CHF11 S (green) in March 1996. ATF was used before then. Pentosin and ATF are miscible. This means that pentosin can be used to top up the fluid level in 993 vehicles before the aforementioned introduction date. On vehicles with Pentosin filling, always fill or top up the brake system with Pentosin."