Yeah, I finally switched to Shell ATF 134 on the 91 300D (also use it in the W210 and W211) and will be extending drain intervals. Rather than do a complete drain at a longer interval, I will probably suck out 2.5 quarts at shorter intervals. Just easier than messing with the pan.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife