Hello All,


Can I get a quick poll on what transmission fluid you are using in a MB 722.303 transmission. In the past I used Dextron III / Mercuron High Milage, and currently using Valvoline Maxlife Multi-vehicle. The transmission is original with about 200K miles.


I am using Mobil Delvac 1 in both my Allison transmissions and really like it. I am thinking a fluid with a bit higher viscosity may be better for the old TM. Any opinions?


Thanks.

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Larry in Mobile, AL
'83 300SD "Goldfinger" 145K Mi W126 E-617.95 T-722.3 15" Bundts

I’m of the same mind. The Allison spec that maps to the obsolete Dexron iii spec is probably the best we can hope for. Some on here have run maxlife, which is a Low viscosity option, and claim good results. Reality is that ATFs historically sheared down quite a bit so it’s viable that an LV fluid would work fine.

Personally, I generally run Walmart Supertech Dex/Merc with Lubeguard red. I run a blend of their hm and regular, since I don’t think their hm is a lower viscosity fluid.

I have blended in a quart or two of Mobil 1 ATF before,mas that is a good fluid. I’m sure Delvac 1 is as good or better.

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)