Customer Concern

• Annual oil service; driver‑door “clunk.”

Findings & Diagnosis

• Door noise traced to hinge/stop hardware wear.
• No DTCs related to engine or chassis systems.

Work Performed

• Liqui Moly oil + OEM filter to Audi spec.
• Adjusted/secured door hardware; verified quiet operation.

Result

• Smooth door action; fresh oil and reset intervals.
• Owner delighted—no more clunk.