Wynn’s Hydraulic Lifter Treatment is a lubricating oil additive that quickly quietens down noisy lifters and restores engine performance and power. Wynn’s Hydraulic Lifter Treatment helps maintain engine performance by oiling the hydraulic valve lifters to eliminate the need for valve clearance adjustments caused by normal wear. Wynn’s Hydraulic Lifter Treatment dissolves gums and varnish deposits in the oil galleries to free sticking lifters and moving engine parts.