That part caused me a race car motor! filled the crankcase with gas.
Yes the rubber/plastic line is only a vent. Shouldn't have much effect on fuel mileage unless it fills up the oil pan!
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)