I am currently the caretaker of a 77 450SL that was donated to a local charity. It will be sold, proceeds will fund the organizations operating budget.

I've spent some wrench time and parts on it--It now runs but not very well. In any case, I should change the fluids before I run it anymore. What is the correct oil for this engine. (I live in St. Louis, hot summers, cold but not frigid winters)

I use 15-40 in my 124s, should I use that in this car as well or do these old 107's like something different?

Thanks,

J. M. van Swaay

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1994 E320 Wagon, 230,000 miles
1995 E320 Sedan, 106,000 miles
1994 E500 Sedan, 79,000 miles