Use the european 0-40 oil that Amsoil has it has the highest spec the Mercedes has out right now, and you will be fine.

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89 Ford F3504x4CC 7.3 IDI turboed Intercooler and running on wvo now powered by a 1997 Cumins
87 300SDL on bio and wvo killed by chevy truck 5-24-06
1999 E300TD black with gray int.