Just had my first oil change & was surprised that they used 7 quarts. My F150 didn't take that much. Is that standard?

 

Yes, my Kompessor uses 7 quarts also... I don't know why but I'm sure some of the more tech oriented members will advise as to the reasoning for that much oil for these cars.

 

Two good reasons, but maybe not all of the reasons:

- More oil means it will stay clean longer--actually the dirty oil is more diluted.

- More oil means it stays cooler and the engine lasts longer.

 

Dosen't more oil also mean a longer time to reach ideal lubrication tempreture, causing more engine wear? Knowing MB, they probably have a system that warms uper-end engine oil more quickly to avoid damage?

 

I doubt if it's significant. Having two extra quarts isn't going to cause engine damage due to temperatures. The temperatures would have to be extreme in order to cause damage or significant wear.

 

Perhaps, but my '99 C280 takes 8.5 quarts and its well known that the majority of engine wear occurs during cold starts. 8.5 qts is over twice the volume of my other car. Heat transfer rates being what they are for synthetic oils, I just wonder how this effects engine lubication prior to optimum operating temps. Bottom line- besides the sludging issue (which can be avoided with proper oil changes) the 112 engine is a performer which lasts-accoring to my information-so, I guess it's a non-issue. I just wonder if there is engineering that overcome this, or if its like you say, insignificant.

 

my c43 takes less than the v6 c280 weird!

 

I think you're putting too much importance on the oil temperature. The engine's tolerances are more important relative to wear. Two extra quarts of oil aren't going to keep friction from warming the engine. What you need isn't an upper engine oil warmer but an efficient oil pump and an oil that flows at a wide temperature range. I think you have both.

If you live in an area where it gets etremely cold during winter, you can get an oil or block warmer to help things along. In most areas, however, you don't need one.

If you use synthetic oil you don't have to worry about sludge, unless you have a poor air filtering system or a coolant leak.

 

I guess so. Back of my owners manual has Capacity for C230 Komp @ 6.1 qts., C280 @ 8.5 qts., and C43 @ 7.9 qts.

I wasn't aware that synthtics wouldn't sludge at all. So, the lawsuit over sludgeing was all about extended use of conventional motor oil?

I suppose I am discounting the effectiveness of multi-visc oils at the low end.

Thanks, Lugnut-you're a fountain of information. Mostly wrong, but a fountain none the less[X(]

 

Yes, it was exactly that. Customers were leaving dino oil in the engine for 10K, thus causing sludge build up and engine damage. Apparently, you're fountain is spreading erroneous information.

Maybe someday we can all be as smart and knowledgeable as you are. We'd all have to dumb-down, though. I'm not sure we're ready for that.