I am running Allison Transynd fully synthetic heavy duty ATF. It is Dexron spec and then some. The heat this stuff can take and remain stable is amazing. This is what is running in almost all garbage trucks. Think of the constant stop and go, full throttle, full braking with heavy loads these trucks do. they almost never come in with failed transmissions. They also almost never come in for transmission service. In reality the oil is only ever getting replaced if a leak develops or some other repair is done. When I switched to it, my 3-4 flare improved. must have some seal swellers in it.

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1982 300sd, new project car to restore

It doesn't matter if you know what you're doing, as long as you look like you know what you're doing.

Let me thank the members that recommended Indie Jim Ellington. Jim
is a class act. He recently completed some extensive maintenance on my Mercedes Diesel. He works only by schedule. His prices are very reasonable and it seems no job is to Big for Jim. It is getting increasingly difficult to find an experienced Mercedes Diesel mechanic outside of a major metro area.
Jim is a bit isolated halfway between Macon and Savannah but he is very accommodating. Thanks again to Jim and the forum

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1990 350 SDL
Currently: 180,000 miles
Factory rebuilt bottom end rods, bearings and head gasket @ 75,000 in 1997

Good ending.

Thanks for sharing your experience with us.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Glad I could help with that. One of these days I'm hoping to meet-up with Jim, too!

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'06 E320 CDI - PEWTER/CHARCOAL
'17 Corvette (C7) Stingray Vert /M7-speed manual trans/3LT/MSRC/FE2/Z51 19"-20" Blk wheels - Arctic White / Jet Black Napa leather interior