PCV system blockage and oil leaks
ModerateEngineFive-cylinder petrol engines build crankcase pressure when the breather system blocks, pushing oil out of seals and making the engine smoky or sweaty.
Est. Repair Cost: £250–£650
Warning Signs:
Whistling from dipstick area, Oil leaks around cam seals, Idle disturbance or smoke
What to Inspect:
- Glove test over the oil filler
- Inspect for heavy oil sweat
- Ask if the PCV system has been renewed
Verified by IsItAGoodCar Research Team