2026-07-22 · 5 min read
Mercedes-Benz CLS — 漏油问题
CLS Oil Leak Points — By Generation
- C218 M276 V6: 2 valve cover gaskets, oil cooler adapter seal — same as E-Class M276
- C257 M256: oil separator hose and turbo oil feed line — inspect at every service
- C257 M264: same 4-cyl leak points as GLC/A-Class (valve cover, oil separator hose)
- Malaysia repair depending on leak location
Oil Leak Detection — Mercedes Engines
Common oil leak points on Mercedes-Benz petrol engines: valve cover gasket (most common — brown residue on top of engine, burning smell), camshaft adjuster solenoids (VVT solenoids — cause misfire codes if oil contaminates the plug wells), and the crankshaft front seal. For turbocharged models (M270/M274), also check the turbo oil feed and return line banjo fittings. Valve cover gasket sets cost for parts; workshop labour adds . Any oil leak near the timing chain area must be repaired promptly — oil saturation of the chain tensioner causes premature failure.