Mazda Tribute: AWD Power Transfer Unit (PTU) Oil Seal Leak

AWD Mazda Tributes use a power transfer unit mounted on the right side of the automatic transmission to drive the rear propshaft. The PTU input shaft seal and output flange seal are known to develop leaks with age, allowing PTU oil to drip onto the exhaust system and produce burning smell or smoke. Undetected oil loss leads to complete PTU seizure and potential damage to the rear propshaft and rear differential. The leak is often masked by accumulated road grime and missed at routine roadworthy inspection.

• Burning oil smell after driving, particularly when parked
• Smoke or steam from under the centre of the vehicle near the exhaust
• Oil drips on driveway under the centre of the vehicle
• PTU oil level low when checked at fill plug

1. 1

   Inspect the PTU from underneath — look for oil wetness around the input seal face and the rear output flange where the propshaft connects.

2. 2

   Check the exhaust centre pipe for oil baking onto the heat shield.

3. 3

   Check PTU oil level via fill plug — it should be at the bottom of the plug threads.

4. 4

   Any burnt oil smell after a test drive warrants a full underside inspection.

Parts involved: Transfer case.

≈A$550 to ≈A$3,220 at independent workshop rates, shown as an approximate guide in Australian dollars. That is for this job on its own, not for the car.

An estimate, converted to Australian dollars, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

• “Has the PTU oil level ever been checked or the fluid changed?”
• “Any burning smell from under the vehicle after driving?”
• “Has the PTU ever had a seal replacement or been serviced?”

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.