Toyota Camry: 2AZ-FE 2.4 Piston Ring Oil Consumption

The 2AZ-FE 2.4-litre four-cylinder engine has a documented piston ring design defect that allows oil to be drawn past the rings and burned during combustion. Toyota issued a specific technical service bulletin mandating oversized piston ring replacement as the repair. A US class action (In re Toyota 2AZ-FE Engine Oil Consumption Litigation) was settled, and the defect was independently confirmed by NHTSA. Engines can consume a litre of oil every 2,000 km under normal driving conditions.

• Oil level significantly below minimum between services
• Blue smoke visible from exhaust under load
• Engine light triggered by oxygen sensor fouled by burning oil
• Rough idle from oil-contaminated spark plugs

1. 1

   Verify oil level against service book to calculate consumption per kilometre.

2. 2

   Inspect spark plugs for oil deposits.

3. 3

   Check exhaust during a hard acceleration run for blue smoke.

4. 4

   If a workshop inspection is possible: Confirm whether Toyota piston ring replacement TSB has been previously performed by checking for a record of engine partial disassembly.

$1,500 to $3,500 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, 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 engine ever had the piston rings replaced under the Toyota TSB?”
• “What is the typical oil consumption between services?”
• “Has any engine work been performed in the past 100,000 km?”

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.