You bought the car from a MB dealer and it came with no service records? Can't they run the vin? Do a search under FSS, it sounds like you bought a car that the PO decided not to change the oil on. However if the car was serviced on FSS and the oil was changed with dino then I am pretty sure the class action suit would cover you. If that was an oil leak you would smell it and see oil. Try a few short changes with Mobil 1 maybe that will clean it out.

Sounds like you are stuck though.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200