Infiniti QX50 J55

2.0L VC-Turbo four-cylinder with world-first variable compression (8:1 to 14:1) — an engineering achievement that's still proving its long-term reliability. NHTSA recall 25V-437 covers 444,000 vehicles for bearing failures. Metal shavings in the oil pan are the early warning for catastrophic failure. Valve adjustment required every 50,000 miles at a dealership. First-generation technology with uncertain long-term track record.

• !! Main bearing / L-link failure — NHTSA recall 25V-437 from 60,000 km

  A possible manufacturing defect in main, A-, C-, and L-link bearings in the VC-Turbo engine can cause engine damage or complete failure. NHTSA recall 25V-437 covers 443,899 vehicles (2019–2024 QX50). Dealers inspect oil pan for metal debris and replace engine if necessary.

  Symptoms: Engine knock similar to a diesel at idle, check engine light, metal shavings or chunks in oil pan, sudden power loss
  6,000–20,000 $
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• !! Timing chain stretch from 120,000 km

  The thin timing chain in the KR20DDET stretches from around 80,000 miles. Rattling indicates the chain has exceeded tensioner capacity. Expensive repair.

  Symptoms: Rattle on cold start, metallic noise from front of engine, check engine light at advanced wear
  2,000–5,000 $
  Ad timing chain KR20DDET QX50 kittiming chain 2.0 VC-Turbo QX50 OEM
• !! VC compression mechanism — unknown long-term durability from 150,000 km

  The variable compression mechanism is first-generation technology. Potential leaks or system failures at 150,000+ miles are not fully studied. Replacement parts for the VC system are very expensive.

  Symptoms: Harsh irregular engine operation, power loss, VC system fault codes, unusual engine noises
  5,000–15,000 $
  Ad variable compression actuator KR20DDET QX50VC-Turbo multilink system replacement QX50

+ 1 more engine weaknesses + vehicle weaknesses