For Mercedes-Benz gasoline engine vehicles equipped with an oil level/pressure sensor with no mechanical dipstick, the instrument panel may indicate that the engine contains too much oil.
This bulletin applies to all Mercedes-Benz gasoline engine vehicles equipped with an oil level/pressure sensor, with no mechanical dipstick. On engines equipped with an oil level sensor, the instrument panel may indicate that the engine contains too much oil.
If the vehicle is mainly driven in the city or used for frequent short trips where engine operating temperature is not reached, with frequent cold starts and lots of short trips, fuel can enter the engine oil in non-combusted condition.
Fuel outgassing through crankcase ventilation is only possible once operating temperature is reached. If normal operating temperature is not reached, the ingressed fuel collects in the engine oil which in turn leads to an increase in monitored oil level. This obviously can reduce oil viscosity which can damage the engine.
On vehicles that are primarily used for short trips, the engine oil level should be checked on a frequent basis.
If required, drain the fuel tank, and replace the engine oil and filter.
About the Author
Information courtesy of Mitchell 1
Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.
Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety ofspecialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.
