Power steering fluid
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AudiWorld Member
Joined: Aug 2011
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From: Spokane, WA
Power steering fluid
I've searched the forums, but I can't find a definite answer for which kind of PS fluid to use in my 87.5 CGT SB. I called the local import guys, and they said prior to '89 Audis use CHF7.1, but everyone else lists the CHF11S. They say DO NOT MIX them, so what is the deal with my car? The owners manual says G002 000, and it cross-references to the CHF11S. I'm so confused.
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From: Boston MA
Educated guess: I believe the CHF11S requirement started mid-90's. It's logical an '87 would use the CHF7.1 due to its age. There are a lot of (foreign) cars that did use ATF prior to these proprietary fluids.
I think someone should check the Owner's Manual or perhaps the Bentley manual to be certain.
I think someone should check the Owner's Manual or perhaps the Bentley manual to be certain.
Thread Starter
AudiWorld Member
Joined: Aug 2011
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From: Spokane, WA
I agree. My owner's manual says G002 000, which translates to CHF11S, but the local import guys are saying no. I'll double check my Bentley manual that I just got in the mail this week (finally) to cross reference.
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I know this thread is old, but..
http://www.blauparts.com/audi/audi_f...rsteeringfluid
"There has been a good measure of controversy over this question. Here is what our own experience shows. Over the last decade we've had no compatibility problems mixing the CHF 7.1 non-synthetic mineral base fluid and the CHF 11S synthetic based Audi power steering fluid. No problems with our own vehicles and no problems with our customers vehicles. Our success in mixing the 2 Audi power steering fluids coincides with the Audi tech bulletin 48-89-T07 issued in November 1989. It states "The new [synthetic Pentosin 11S] and old power steering fluid [non-synthetic Pentosin 7.1] can be mixed if necessary ... the part number [remains] unchanged." So according to Audi, you can mix the 2 Audi power steering fluids. Even though the composition of the fluid changed (CHF 11S synthetic mineral oil vs CHF 7.1 non-synthetic mineral oil), Audi didn't even change the part number. All 1990 - on Audi models have come filled from the factory with the synthetic CHF 11S Audi power steering fluid (G002000). Please Note: Never mix generic power steering fluid or other fluid with the CHF 7.1 or CHF 11S Audi power steering fluid (G002000). If you or someone else did, flush the Audi power steering fluid as described below."
http://www.blauparts.com/audi/audi_f...rsteeringfluid
"There has been a good measure of controversy over this question. Here is what our own experience shows. Over the last decade we've had no compatibility problems mixing the CHF 7.1 non-synthetic mineral base fluid and the CHF 11S synthetic based Audi power steering fluid. No problems with our own vehicles and no problems with our customers vehicles. Our success in mixing the 2 Audi power steering fluids coincides with the Audi tech bulletin 48-89-T07 issued in November 1989. It states "The new [synthetic Pentosin 11S] and old power steering fluid [non-synthetic Pentosin 7.1] can be mixed if necessary ... the part number [remains] unchanged." So according to Audi, you can mix the 2 Audi power steering fluids. Even though the composition of the fluid changed (CHF 11S synthetic mineral oil vs CHF 7.1 non-synthetic mineral oil), Audi didn't even change the part number. All 1990 - on Audi models have come filled from the factory with the synthetic CHF 11S Audi power steering fluid (G002000). Please Note: Never mix generic power steering fluid or other fluid with the CHF 7.1 or CHF 11S Audi power steering fluid (G002000). If you or someone else did, flush the Audi power steering fluid as described below."
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Thread Starter
AudiWorld Member
Joined: Aug 2011
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From: Spokane, WA
Nice read! I had never read that before. I did end up using the CHF 11S, but I flushed the entire system of the old fluid before switching fluids. So far it actually seems to turn a bit easier. Could be just a placebo effect, but I am happy to be in denial. I'm curious to see if the synthetic ps fluid leaks past the seals over time like many synthetic oils do in engines.
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