Would love to share info(dealer only) on properly maintained FSS engines that have SLUDGE, but I can't. Seems like BMW is also having this problem, even with synthnetic oil!! OLD saying; pay me or pay me later! OIL is cheap.

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MERCEDES BENZ MASTER GUILD TECHNICIAN (6 TIMES)
ASE MASTER TECHNICIAN
27 YEARS DEALER M.B. Shopforeman
190E 2.3 16V ITS SCCA racecar