Since Mobil 1 changed their formulation and does not include Dexron 3 I've been looking at alternatives, ended up buying Red Line Synthetic ATF Type (D4), it still has Dextron 3 in the description. It's $30 per gallon.
Elf also has fully synthetic Dexron 3 ATF available, but it's hart to find, I've been using their engine oil fr my CDI and it's excellent, already bought 2 gallons for my 87".

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1987 300D
2005 E320 CDI

Funny, i was at this point 2 weeks ago. I love redline, works great in my 4runner. I will put it in later once I get the shifting issues taken care of. I'm using the cheaper Valvoline 75k hi mileage ATF for now.

I thought you weren't supposed to use synthetic tranny fluid in a MB??

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1984 300SD Turbo Diesel 150,000 miles

OBK member #23

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

The syn atf should be fine for your 87; but not for the CDI. It would use MB fluid only as it is the ONLY fluid containing the proper friction additives designed for use with that trans. Its a Dex 3 based fluid; not a syn.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

What is the cut-off year where synthetic shouldn't be used? I've been thinking about switching over to Red Line also, but I'm not sure if it's recommended or not for my model year.

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1995 E300 Diesel
2002 GMC Duramax CC LB 4X4

Proprietary MB fluid came about with the 722.6 trans. That trans, pending model, showed up in 96 or 97.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

Thanks, I'm I'm good to go...

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1995 E300 Diesel
2002 GMC Duramax CC LB 4X4

Lovecr@p is the only one I know of. They say not to change the tranny fluid at all, ever.

In a CDI I would use whatever fluid the 722.6/9 calls for, which is sold at your friendly local MB dealer.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200