| On some MB models the oil contamination state is sampled by a sensor in the sump. Not sure that this applies to the B but I think there is a fair chance.
With modern synthetic oils, say Mobil 1, if you were able to filter out all contamination they would have indefinite life. The oil itself doesn't "age" it becomes useless because of the combustion particles held in suspension within it.
MB trucks have 100,000km oil intervals admittedly with large oil tanks and filters.
In the UK Mobil 1 is retail £12 per litre. At that price I am in no hurry to change more often than the Assyst message. I do, however, top up to the maximum mark frequently to keep oil condition and therefore oil change interval as long as possible. It will be a dead heat between the mileage message and the two year default for service.
My car skipped the A service and went straight to indicating a B service from new, I thought this was odd but now read above that this maybe programmed in. |