🚗 Classic Fault — BMW (1982–1994)
E30 differential output flange oil seal leak
💰 Estimated Repair Cost
$25 – $80 GBP
Parts and labour estimate
🔧 Tools Required
Seal driver, diff output flange tool
📋 Overview
The differential output shaft oil seals on the E30 weep with age and coat the driveshafts in oil.
🩺 Symptoms
- Oil on rear driveshafts
- oil on underfloor
- diff oil level dropping
- oil flinging onto bodywork
🔍 Possible Causes
- Worn differential output oil seals
- worn output flange bearing surface
🛠️ Diagnosis Steps
Clean driveshafts and recheck after 200 miles — oil re-appearing confirms diff seal leak
✅ Most Confirmed Fix
Differential output seal replacement
86% of users confirm this fix worked (22 reports)
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