🚗 Classic Fault — Mercedes-Benz (1968–1976)
W114 rear differential output seal leak
💰 Estimated Repair Cost
$30 – $100 GBP
Parts and labour estimate
🔧 Tools Required
Seal driver, differential drain tools
📋 Overview
The differential pinion and output shaft seals weep on high-mileage cars, contaminating the driveshaft and underfloor.
🩺 Symptoms
- Oil patch under rear of car
- diff oil on driveshaft boots
- differential oil level dropping
🔍 Possible Causes
- Worn output shaft oil seals
- worn pinion seal
- overfilled differential
🛠️ Diagnosis Steps
Clean underfloor around differential and check after 100 miles — identify which seal is leaking
✅ Most Confirmed Fix
Differential seal replacement
84% of users confirm this fix worked (16 reports)
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