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I’m in the process of wrapping up my P/S rack R&R. It has had a consistent slow leak for the past 2 years so finally I removed the rack and sent it for re-seal. It is now all button up but I’m a bit confused as to which fluid to run. My 95 993 is a very early build, 04/1994 to be exact. Pentosin seems to be the favorite on RL, but then most 993s aren’t the early build. The manual states Dex II. Would Dex III (all I could find) work or better to go with Pentosin? Thanks for your input.
Pentosin CHF 202. Some people use the older Pentosin 11S but largely everyone has switched to 202 and is fully compatible and recommended. Believe there are service bulletins which recommend it, so I would go with the superseded information.
100% certain. It's printed right on the can that Pentosin CHF 202 is compatible with the older 11S but not CHF 7.1
Also, attached is the service bulletin from when the factory switched from ATF to 11S (before 202 was developed) . It also states that you can put 11S in a system that previously had ATF in there.
I always thought it was weird they specified ATF first, then eventually the Hydraulic fluid/ PS fluid.
I'm assuming ATF was the standard before more specific PS fluids were developed in the 90's. Per the TSB, the factory switched fluids during 993 production for the following reason:
"Pentosin has been selected for use because of better and more uniform viscosity behavior at low ambient temperatures."
100% certain. It's printed right on the can that Pentosin CHF 202 is compatible with the older 11S but not CHF 7.1
Also, attached is the service bulletin from when the factory switched from ATF to 11S (before 202 was developed) . It also states that you can put 11S in a system that previously had ATF in there.
Interesting! I'm going to kick-start a similar conversation over in the 928 forum. My 928S4 uses ATF in the steering system and would be wonderful if I could get the whole stable on the same diet.
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Which Power Steering Fluid?
