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Read this on WJJeeps:

Mopar®P/N 04883077 Hydraulic fluid / Power steering fluid (MS5931)

MS5931 IS THE ONLY FLUID THAT CAN BE USED FOR THE POWER STEERING SYSTEM. NO EXCEPTIONS!

Important note:
The factory fill power steering fluid for all 1999-2004 Grand Cherokees is a unique fluid, MS5931. ATF+4 (MS9602) should not be mixed or used as a "topping off" fluid on the Grand Cherokee WJ. All WJ models should be serviced using ONLY the special MS5931 fluid. ATF+4 is NOT an approved Power Steering Fluid and should never be used under any circumstances. Note that all fluids will darken in color with usage and fluid color is no longer an indication of fluid condition.
I didn't know this when I first got my Jeep and I'm pretty sure I topped it off with ATF+4. Am I screwed? I haven't had any issues at all and it's been about a year and a half. Do you all adhere to this pretty well? Any experience deviating from this? Where is the best place to buy MS5931?

:(
 

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what i think im finding out is the P/N 04883077 in my manual DUH! and from online info its (ms5931).... MS5931 is amber/yellow. the valvoline power steering fluid has the chrysler spec is 5931 - its also a clear amber/yellow color so is that the same as ms5931??? looks like it should be
 

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Read this on WJJeeps: I didn't know this when I first got my Jeep and I'm pretty sure I topped it off with ATF+4. Am I screwed? I haven't had any issues at all and it's been about a year and a half. Do you all adhere to this pretty well? Any experience deviating from this? Where is the best place to buy MS5931?:(
Don't think you're screwed in just topping off the PS fluid with ATF+4 but heard it's hard on seals if your PS unit doesn't call for it. Believe I'd just change it out by disconnecting the return line w/it flowing into a container while adding new fluid to the reservoir.

So are you asking if ZJ owner's adhere to the MS5931 specs and use only Mopar PS fluid? I use any kind of PS fluid designated for Chrysler vehicles, most all of it meets the MS5931 specs, and haven't had any problems. This goes for my 96 ZJ, wife's 2000 TJ, son's 96 XJ and my spare 93 XJ.
 

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What Uni said isn't a bad idea to do on a regular basis, as it keeps the gear and the pump in better shape. The fluid has a pretty good affinity for moisture and that ain't good for cast and machined parts. Breaking a gear down shows this. Mine had rusty looking gunk all in it.
 

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Note: the 01-04 WJs w/4.7s, engines have a hydraulic cooling fan that's powered by the PS Pump! Use incorrect fluid and you will kill the hydraulic fan.

MS5931 04883077 spec that is no longer available


In April of 04 Mopar released the 5142893AA. At first it was thought to cover just the WK's.
Then in May 04, Mopar released a parts and service bulletin to use the 5142893AA on 01-04 WJ 4.7's

Therefore 05142893AA is the correct power steering fluid for 01-04 WJ 4.7's .

05142893AA has been superseded to 68234631AA.

The 68234631AA fluid is the same clear amber color, same viscosity & smells exactly the same as original.

This stuff is getting rare, I suggest you grab some while you can.
 

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Note: the 01-04 WJs w/4.7s, engines have a hydraulic cooling fan that's powered by the PS Pump! Use incorrect fluid and you will kill the hydraulic fan.

MS5931 04883077 spec that is no longer available

In April of 04 Mopar released the 5142893AA. At first it was thought to cover just the WK's.
Then in May 04, Mopar released a parts and service bulletin to use the 5142893AA on 01-04 WJ 4.7's

Therefore 05142893AA is the correct power steering fluid for 01-04 WJ 4.7's .

05142893AA has been superseded to 68234631AA.

The 68234631AA fluid is the same clear amber color, same viscosity & smells exactly the same as original.

This stuff is getting rare, I suggest you grab some while you can.
The guys over on the WJ forum need to know that. This is the ZJ forum so I don't think it applies to us.

GW
 
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