And now the opposite problem with Trans fluid

[Dreman]

A few days ago Tonka asked if he could get away with using Dexron III for a few miles instead of the Trac's required Mercon V, and the consensus was NO. However, I have some spare Mercon V, and wonder if it would work well in my '99 GMC that takes Dexron III. At 226,000 original miles it may be better to stick with what it's used to, but Mercon V is supposed to be a better version of the same thing.



Any comments?

 

[TRACket Paul]

It's the same problem. Don't substitute.

 

[Dreman]

My question wasn't really about compatibility as such, since the bottle says it is also compatible with systems that run Dexron III. Mercon V is really just a new and improved version of Dexron III. My question was more to do with the age of the transmission, and changing to another type.

 

[Aaron Laake 2]

At that many miles, I would probably play it safe and stick with what you have been using all along. Congrats on that many miles.



The Hawk