🚗 Classic Fault — Toyota (1984–1989)
MR2 Mk1 supercharged 4A-GZE blower oil seal leak
💰 Estimated Repair Cost
$40 – $200 GBP
Parts and labour estimate
🔧 Tools Required
Supercharger removal, seal driver
📋 Overview
The Roots-type supercharger on the 4A-GZE leaks oil from the front seal and contaminates the inlet.
🩺 Symptoms
- Oil mist from inlet area
- blue-grey smoke under boost
- oil consumption
- oily interior of inlet tract
🔍 Possible Causes
- Failed supercharger front oil seal
- overfilled supercharger oil
- cracked supercharger housing
🛠️ Diagnosis Steps
Remove inlet tract and inspect supercharger snout for oil residue. Check supercharger oil level — should be 100-120ml
✅ Most Confirmed Fix
Supercharger front seal replacement
72% of users confirm this fix worked (14 reports)
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