Hi Scotty. I have a 2012 Mercedes C250 4 cylinder turbo. Around 25K, my turbocharger broke and the tailpipe was emitting lots of black smoke. Before 25k, I've checked the crankcase and it was relatively clean. Mercedes dealer replaced the turbocharger under warranty, but I can see black gunk in the crankcase. The dealer assured me everything was okay and I drove the vehicle another 20K. The engine is not making any funny noises or tapping sound. However, at the 45K routine maintenance, the dealer decided to pull the valve cover because they saw the black gunk in the crankcase like I did. When pulled, you can see sludge buildup, some are baked on. See attached photo. Dealer requested an engine replacement from Mercedes Corporate due to the previous faulty turbocharger which gunked up the engine. Mercedes Corporate denied the engine replacement and made up some excuse that I rolled back the odometer and only engine with 100K miles would look like that. Took the car back to have it diagnosed by two independent mechanics. First mechanic said to trade the C250 in as quickly as possible, because the engine will seize and die at any moment. (I have lose about 10K if I trade in) Second mechanic said to do frequent seaform engine flush every 2k for 10k, and the engine should last to 100K miles, then I can trade it in with little lost. I went with the first seaform flush and alot of gunk come out during the oil change. The coolant temp is running a bit higher than usual but went down a little after the seaform flush. My question: Should I trade it in right now and take the 10K monetary lost, or do the engine flushes and run the car until 100K miles then trade it in. Replacing the engine is not an option because too expensive (quoted 20K by dealer) and your video said engine replacements are usually done improperly and it will never run right. Do you think with frequent engine flushes I can make the engine last a couple more years? It is not making any funny noises or tapping sound which the dealer confirmed it is not making any engine problem sounds. Thanks!