Nulon Lifter Free & Tune-Up quietens lifters that are noisy during the first few minutes after start-up or during normal driving. The advanced cleaning formula safely softens and removes carbon and sludge deposits which are the major cause of noisy lifters. Hydraulic lifter noise can be caused by several different factors Carbon particles blocking lifters Sludge, wax or varnish deposits causing sticky/noisy lifters The use of incorrect engine oil viscosity Mechanical damage to camshaft or lifter Broken parts within the lifter, e.g. relief valve springs Nulon Lifter Free & Tune-Up can be used to correct causes 1 and 2 above. It can also be used as a diagnostic tool. If a lifter is still noisy 14 days or 500 km after using this product, it can be assumed that previous mechanical damage has caused the lifter noise. The lifters should be removed and inspected or replaced. Benefits Quietens noisy hydraulic lifters/cam followers Suitable for all petrol, diesel & LPG engines Cleans oil galleys in hydraulic lifters Removes sludge & soft carbon Frees up sticky lifters Will not affect oil viscosity