RepairPal Certified shops can diagnose and repair your 1994 Mercedes-Benz E420. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
The oil filter is in a housing, it is a cartridge not a spin on type filter. It is toward the front of the engine with a spin on nut on top of the cover on top of the oil filter housing (very simple to change).