Started the car and let the oil warm. Added the product with the engine running as to mix properly. Heard a difference within minutes. The more I drove, as time went by. The better the results. A definite improvement. Highly recommended for its intended purpose. Bought an extra bottle for my brothers Chevy 5.3 liter pick up and had the same or better results.

Worked well on 2003 xc70 with some lifter noise.

Added Hydraulic Lifter Additive to 2006 BMW X3 at last oil change because my wife was commenting that everyone thought there was something wrong with her car because there was a lot of lifter chatter. The next week she asked what I did to her car because the chatter was considerably less. I have used other additives in the past but will be using Hydraulic Lifter Additive from Liqui Moly on subsequent oil changes because it has made a significant difference.

tried this as alternative to oil flush/fill 3/4 qt low, used 2 cans of this for 8 qts seemed to rejuvenate oil & quit/smoothen engine.2,000 miles still improved running.

Few days after using this product, the clicking noise of the engine disappeared.

After I added it to my oil change. My 602 300D 2.5 Turbo. My engine is a lot quieter.

Excellent stuff I just changed my oil and added this to 6.9 quarts of oil. Definitely noticed an improvement especially during cold morning starts. Before this my X5 would get up to temperature and then I could hear the lifters a little louder than normal even after the truck had been running for like 10-15 min. This has solved my dreaded valve noise. Thanks FCP for the quick ship, and Liqui Moly for some great products!