I wouldn't go quite that far. It's true, that new generation MB's (non AMG), equipped with the M272/273 engines have scheduled service intervals of 13,000 miles. They no longer use the Flexible Service System oil level/condition sensor from the earlier M112/113 engines, they just have a simple switch to indicate low oil level. An MB engineer told me that sludging starts within "several hundred" miles of exceeding the mileage interval. Every month my shop does a couple of overhauls due to oil consumption/sludging/knocking issues. Invariably, I find that alot of these cars have had oil changes at 14,000-15,000 mile intervals, so he must have been correct. I've never seen an oil filter clogged though.