TROUBLESHOOTING GASOLINE ENGINES
LIQUI MOLY Solutions: Tapping or Clicking Noise
Also known as Lifter Tick, these tapping and clicking noises happen because the Hydraulic Lifters aren't being properly lubricated. This is usually caused by a dirty Oil System, low oil level or a wrong oil for the engine. Another reason for Lifter Tick could also be worn or faulty hydraulic lifters.
If the oil system of the engine is known to be properly maintained, use LIQUI MOLY Hydraulic Lifter Additive in the engine oil, to ensure adequate lubrication of the lifters and dampen worn lifters ticking.
A thorough Oil Change is recommended when due:
The use of anti-friction additives can also assist in improving lubrication, specially in cold starts when the motor oil has not yet been delivered to the cylinder head where the hydraulic lifters are.