The oil cooler should start getting hot at 95C oil temp. IF not then the gauge/sending unit must be OFF. The oil filter thermostat is the only control!
Do you have an infra-red temp gun to see how hot the oil filter is?? Or maybe borrow one to see.
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)