Use this every couple of oil changes with MoS2 and Molygen 5w-40 and have noticed a difference in my engine being much quieter and smoother.

I'm not a huge fan of oil additives. Frequent regular oil changes should be enough.

..So far so go. Will be more apparent in the next 20-30k miles.....

Installed this additive into my E39 540i and E38 740iL, and have not noticed any appreciable differences, but I'm hopeful it's living up to its claims.

After I used the Liqui Moly engine flush, I used CERA TEC oil Additive along with fresh Liqui Moly oil kit. The hydraulic lifters stopped ticking and the engine got quiter and smoother. I also bought Liqui Moly Hydraulic Lifter additive, but I did not use it because I did not think I could mix it with CERA TEC. Any ways it solves the ticking problem.

Gotta say, this is one of the few additives I can say definitely works. Dumped 2 cans in my 140k mile 2012 Audi A6 with the 3.0 after a fresh Liqui moly oil change. Car had the dreaded startup rattle from the timing chain tensioner that all of these 3.0 engines have. I've been putting up with it for over 10k miles. However after a Liqui Moly engine flush, fresh oil and 2 cans of this stuff, the engine sounds like a new car on the lot. All the clacking and chatter is gone, and the start up rattle is gone if I start the car every day. If I let it sit 2 days it has a slight rattle, but I would say 1/4 the time before I added it. Absolutely amazing product. Engine idles smoother and the car feels like it's off at idle.

I know the N54 is a noisy engine because of its diesel-like injectors, but this stuff is insane at how quiet it makes it. While standing at the front of the car, it has more than halved the noticeable fuel system noise that I had become accustomed to. From the inside, it's about normal, and I don't notice that much difference in MPG or anything like that (may update if there are somewhat magical results), but overall can't complain. Makes it sound like it's not broken, which is a question I've gotten before and then awkwardly had to explain the N54 fuel system to a stranger.

I first tried it on my E46 325i and was impressed. I added it to my wife's SUV and my weekend toy, as well. A quick internet search shows this stuff is for real.

I am currently using this on two different engines, a Subaru 2.5 and a Jaguar Supercharged V8. They are a lot quieter on startup, run up through the range more smoothly and sound healthier at the high end. The fuel economy is also up, with winter gas it's hard to tell just how much but the big motor is easily 1.5mpg better than before. I will definitely buy this again.

Ran In my engine at 30k , noticed my engine is much smoother will be using for my next service every 30. Highly recommend.