Buy Mercedes Cls550 < Free × 2026 >

: The M278 engine often develops leaks from the plastic turbo coolant lines, which should be upgraded to aluminum, and oil seepage on the back of cylinder heads.

: In pre-facelift models (2012–2014), the timing chain tensioner and lack of check valves are major weaknesses. A cold-start "rattle" is a warning sign of imminent failure, which can require an engine-out job costing thousands. buy mercedes cls550

: The CLS550's signature air ride is prone to failure, particularly the air springs and compressor. Replacing a single air strut at a dealership can cost $2,500–$3,200 , while a full system overhaul can exceed $8,000 . : The M278 engine often develops leaks from

If your intent is to understand the "deep" or significant mechanical components that often require attention when buying, the following are critical: : The CLS550's signature air ride is prone