Mercedes W221 S-Class Coolant Loss — Plastic Pipe Failure
Multiple plastic coolant pipes and T-pieces on the M272/M273 V6/V8 engines in W221 crack with age. Coolant loss is often gradual and may not be immediately visible. Sweet smell from engine bay and slight temperature gauge rise are early indicators. A full cooling system inspection and plastic component replacement every 80,000 miles is recommended.
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