How do i know when to change my differential fluids? i have 54k miles, and when i bought it, it had 46k miles and the dealership said they couldnt tell the condition of the fluids without taking the differential apart, and by then they would just go ahead and change them. so my question is should i go get my fluids changed? i go offroad couple times every week or so. if this makes any difference.
2006 Grand Cherokee Limited, QDII, 4.7L V8, 245/65/17 Firestone Destination LE, smittybilt rear d ring shackle reciever,
I would absolutely do it. You dont know if it has been changed before, and at 54k its likely far overdue. Much cheaper and easier to do yourself, however...I think I did mine for under 50 dollars including the lube, sealant, gasket scraper, etc.
You can get the diff fluid (75W-140 synthetic) at any parts store. The friction modifier, one bottle per diff, can be had at the dealer. It's not expensive. The transfer case fluid is best bought there as well.
You can suck the old fluid out of the rear diff instead of removing the cover if you so choose. The front diff has a drain.
I would do the transfer case as well while you're under there.
every 30k..... thats what most jeeps have in the manual.
2004 WJ Limited 4.7 H.O
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17" XD Series Spy Rims- Custom Painted
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I believe that is not true. I use the modifier with Mobil 1 75W140LS. I would read some of the other posts on this topic. I just did the WJ diffs a week ago. I did the XK last summer.
Mobil 1 is good stuff, but .
Read the specs on the M1! Besides I've been using it for the last 25K with NO problems and NO additives!
"there is a difference between LS oil and friction modifier for oil as specified by Mopar"
Please explain the difference! FM is for use in LS applications.....LS isn't a lube, it's an additive that M1 contains and is sufficient for MOST applications!
From Mobil's site:
Mobil 1 Synthetic Gear Lube 75W-140 LS contains special friction modifiers designed for limited slip-type differentials. In most applications, the addition of special LS (limited slip) additives is not required. For axles requiring the highest level of limited-slip performance, OEM specific LS additives can be added to this fluid.
LS isn't a lube, it's an additive that M1 contains and is sufficient for MOST applications!
I know that LS is not a lube. However, 75W140LS is a gear oil that has been modified. The question is whether it has been modified properly per Mopar specs. Unless Mopar says that Mobil 1 75W140LS is all that you need, I would be careful on your assumptions.
In most applications, the addition of special LS (limited slip) additives is not required.
Yeah, it's the "most" that's the important part here. That doesn't mean "all," and Chrysler has always recommended Jeep specialty differentials use the additive regardless of what lube you use. In the case of some differentials, it was very, very obvious the Mobil LS wasn't sufficient.
2006 WK Laredo 4x4 4.7L
1993 ZJ Laredo 4x4 4.0L — Dead, sold, and rolling again