Mercedes-Benz AMG CLS53 2019–2025 — technical service bulletin

Bulletin LI03.20-P-078715 · NHTSA communication 11012055 · issued Dec 19, 2024

Technical service bulletin

communication type

Engine

component

2019–2025

model years

vehicle entries

Official summary

Complaint Low engine oil level warning. Engine oil leak under vehicle. Cause Rear crankshaft radial seal rolled during installation Remedy -Check for external oil leak with visual inspection. -Remove inspection cover on left side of transmission and check for oil in bell housing. -If oil is found in bell housing, remove transmission and determine location of leak. Replace rear crankshaft sealing ring if found damaged or leaking. -If ISA is found to be contaminated with engine oil, replace the integrated starter/alternator.

Vehicles covered

What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.