Go to your local dealer and see if you can still buy the service book for the car. The one that would of came with the car when new. I was able to get a reproduction owner's manual for my '80 300SD from the dealer. It cost about $15. So maybe the maintanence may be still available.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member