Is there a coolant drain in the block, and if so where? Does this engine have valves that need to be manually adjusted for lash? My search turned up a mention of the later M117s having an auto-valve lash adjustment feature.

Any reason not to go with mobil1 for the engine oil and ATF?

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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