Any service shop should be able to change these fluids, there is no need to use the Dealer proprietary tools to change fluids, you should be able to have this performed at a far lower price at an independent shop.
Dealers have been caught using the wrong fluids, but for the most part you can trust them to use the right fluids. And that is the risk with independent shops, they are more likely to use what they have in stock or on hand, that is NOT the right fluid. Make sure to discuss that and the fluid to be used before the job is done, better yet, purchase the correct fluid yourself and deliver it to be used when they do the job, most independent shops will agree to that.
If you have the V6, then you have the NAG1 trans that requires a special tool to check the fluid level, NOT all independent shops will have it, the V8's any independent shop should be able to change trans fluid.
The QDII drivetrain, that has ELSD's differentials requires an additive friction modifier, the rest do NOT. The O.M. and FSM states generically to use the Friction modifier in all the Differentials, but its NOT necessary for anything that does NOT have the ELSD, it doesn't hurt, it doesn't help, and you paying extra unnecessarily. If you do have QDII with the ELSD's, you definitely need the friction modifier, without it, the ELSD's won't perform properly and the clutches in them will wear much faster.
I'm NOT aware of any additive to extend the life that the Dealerships uses for differentials and TCase, a good quality oil already has the best additives in it. Most additives are snake oils that do NOT work, the O.M. warns against using them. A few additives have their place, if you need them, but in most cases people do NOT.
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Last edited by Mongo; 07-31-2011 at 06:36 PM.