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October 23, 2026 Service bulletin

Complaint Oil seeping from turbocharger oil return line at connection to engine block

Mercedes-Benz technical service bulletin LI09.40-P-079068 for 2022-2024 Mercedes-Benz C300, 2023-2024 Mercedes-Benz E350 and 2023-2024 Mercedes-Benz GLC 300 and others.

Bulletin number
LI09.40-P-079068
Component
Engine
Summary
Complaint Oil seeping from turbocharger oil return line at connection to engine block. Low oil level warning. Oil observed under vehicle. Cause Return line under tension due to turbo rotation. Remedy Inspect turbocharger housing for rotation (refer to attachment). If rotation is confirmed, the turbocharger and oil return line must be replaced.‑Resealing or replacing only the oil return line is not sufficient and will not resolve the symptom.‑Clean noise insulation on right side of engine if necessary. Replace insulation if cleaning is not sufficient.‑Observe foot notes regarding additional parts in XENTRY parts information when ordering turbocharger.

Owners of these vehicles have filed 38 complaints in the engine category.

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