[scrubjaysnest]

Originally Posted by Pitbull

Again, if a synthetic meets the API spec for that engine or diff and they can not PROVE the product caused the failure, it is against the law to void the warranty, no matter what is in the owner's manual.

http://en.wikipedia.org/wiki/Magnuso...s_Warranty_Act

Koz

This is more a case of who has the better do we cheatum and how other wise known as a lawyer. That being said, the DW's cherokee requires synthetic gear lube in both diffs. API specs indicate an after market, non Chrysler, gear lube should be ok but AAMCO isn't 100% sure so they recommended using the Chrysler gear lube. Based on my own experience with a GM product We go the more expensive route and will let the AAMCO and Chrysler lawyers fight it out if needed

We do a lot of saltwater fishing and from personal experience know that bearing greases with the same API are not created equal. Most get hard after about six months exposure to salt water where as some do not.