Had my just starting to leak rear end pinion seal replaced at a Dodge dealership today.The tech told me the reason it started leaking is that I was using Royal Purple synthetic in the rearend. He said they had gotten a TSB on this subject using anything but dodges synthetic would cause this. I said the truck had 105,000 miles on it, don't these things just wear out?He said maybe.Ihave been using royal purple in there for around 60,000 miles with no probs. What do you guys think???

 

Wife's tales / mechanic's tails .
In other words , a load of poo .
Ask to see the TSP .

 

I'm not positive but do recall AAM rep telling about incompatible additives floating around that over time could diminish the life of seals. Something about European additives or chemicals. And who knows where some of the additive packages originated or were supplied from. The spec numbers really mean something beside license to put someone else's magic oil where it may not belong. JMHO

 

Well . .

John Faughn (post #2 above) is calling it truly correct. Just plain out and out BS - ask to see the TSB - no such animal. They just want you to buy Mopar fluids from them.

I had my leaking pinion seal replaced under warranty at the dealership yesterday, 35K miles, using Amsoil 75W140, nobody said a word about my NOT using the Mopar stuff, just fixed the seal. If that TSB stuff were true, my dealership would not have endorsed Amsoil fluids as the best you could use.

In fact, what they did say yesterday to me was that there were MANY 2006 trucks that had the seals fail right around the same mileage as mine did. The GOOD news was that my seal replacement WAS NOT a factory replacement part. They were waiting for their order to come in from Dodge Parts and got a FELPRO seal from a local auto parts to do my repair. The visible difference between the FELPRO and the Dodge seal is VERY remarkable, the FELPRO is a much better constructed, better quality, sturdier looking seal.

I have used many different synthetics in many different differentials throughout 45 years of driving trucks. This is the first diff pinion seal I have ever had leak in under 150K miles on any vehicle. Probably the truth is that AAM or Dodge is NO different than any other manufacturer, they buy from the lowest bidder - might also suggest something relative to the quality of the seals, eh?


CD

 

Yeah BS, I had a pinion seal go out on mine with the stock oil in it. The pinion seal is a wear and tear item, it will leak eventually...thats a given..

 

Ask the tech for the TSB number and see what he gives you. I'll bet a lot of humming and hawing.

L8r,.........dogger

 

Thanks guys....kinda what I was thinkin'.Like I said been using this stuff for a long time.