docj Posted December 29, 2015 Report Share Posted December 29, 2015 Many older Class A's and most new ones are running with Transynd (TES 295) fluid. One thing I hadn't found was a definitive recommendation as to how often filters and fluids should be changed if you are using this fluid. I've seen all sorts of numbers tossed around in forums and there was a knowledgeable, former Allison technical type who said that the lifetime of the fluid should be nearly infinite with the usage most of us give our rigs, but I still was looking for a statement directly from Allison. I just came across this document which provides the service intervals recommendations for the transmissions used in most motorhomes with either TES 295 fluids or conventional DEXRON: http://www.rvmobilelube.com/1099c.pdf To summarize the recommendations for the 3000 and 4000 families of transmissions using TES 295 fluids, which are the majority of the ones found in DPs, the filter change interval is 75,000, 3000 hours and/or 36 months. The fluid change interval is 150,000 miles, 4000 hours and 48 months. I've been changing filters on a ~4 year basis which, for us, corresponds to ~40,000 miles but <1000 hours. I'll probably maintain this cycle, but might go to 5 years. As for fluid, I've been having fluid analysis done by JG Labs to verify that key parameters are in spec. I have ~50,000 miles on my Transynd fill but that only corresponds to ~1,250 hours. As long as I continue sampling I think that it's probably Ok to continue to use the fluid for another ~5 years without feeling like I'm putting myself at risk. Link to comment Share on other sites More sharing options...
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