🚗 Classic Fault — Mercedes-Benz W115 (1968–1976)
Oil filler cap seal perished — top end oil seep
💰 Estimated Repair Cost
$3 – $10 USD
Parts and labour estimate
🔧 Tools Required
None
📋 Overview
The rubber ring seal on the cam cover oil filler cap hardens and cracks, allowing oil to seep out during running and contaminate the engine top.
🩺 Symptoms
- Oil seeping around filler cap
- oily residue on cam cover top
- oil smell from engine bay
🔍 Possible Causes
Hardened filler cap seal
🛠️ Diagnosis Steps
Remove filler cap and inspect rubber seal. Should be soft, pliable, and round cross-section.
✅ Most Confirmed Fix
Replace oil filler cap — includes new seal.
94% of users confirm this fix worked (62 reports)
🔗 Other Mercedes-Benz W115 Faults
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