Help reduce engine noise and maintain your engines hydraulic lifters with Nulon Lifter Free and Tune Up. The most common cause of valve train noise is from blocked or sticking hydraulic lifters due to excess sludge, varnish, carbon or waxes left behind from general engine wear and tear. Nulon Lifter Free and Tune Up will safely soften and remove these contaminates, clearing out oil galleys and allowing hydraulic lifters to operate correctly. Easy to use, simply add into your engine after an oil change has been completed and leave in until the next service is due. Suitable for use with all petrol, diesel and LPG engines and is safe to mix with all oil types including mineral, semi-synthetic and full synthetic blends.