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Hi there, I bought a used 2011 Chevy Tahoe 4WD with 151k. As soon the car is released and street legal in Germany, I do a full oil/fluid replacement incl. all filters + spark plugs and spark plug wires. In regards to my engine oil change, this is my plan: 1st engine oil change I plan to use an oil sludge remover to "clean" the engine from inside. Its called Liqui Moly Oil Sludge Flush. With the new engine oil, I plan to add Liqui Moly Hydraulic Lifter Additive . 2nd engine oil change (...when its due next time) I plan to use another engine cleaner called RAVENOL Professional Engine Cleaner to make sure that all debris are removed as much as possible. With the new engine oil, I plan to add an additive called TriboTEX Original In regards to coolant change I want to use a coolant system cleaner and a radiator stop leakage which can be used preventively. I am also going to permanently disabling the AFM on software level done by a US car tuner. I heard/ read that the Vortec 5.3L engine in those 3rd Gen Tahoes tends to build up oil sludge so I thought it might be a good idea for a good engine flush. Anything pro or contra? Any feedback is highly appreciated. Please stay safe and healthy! Niels