oil filter on 1997 Mercedes-Benz C280

where is the oil filter located

2 answers
The oil filter is a "cartridge style" oil filter not a traditional "spin on type filter". The filter is in a housing that has a spin on cap on top of the housing. The housing is on the driver's side rear of the engine compartment.
Pull up the front part of the engine cover [plastic] You'll see it.
It is a cartridge inside the black canister.