Highly recommended for TDI engines, which carry a lot of exhaust particles in the oil suspension. Super simple to use. Be sure you get enough for the size engine/oil capacity. My Q7 TDI requires two bottles since it takes nearly 9 quarts of oil. I initially bought this to add to my first oil change post-purchase of my used '10 Q7 TDI, as a way to get back to a 'baseline' reset of scheduled maintenance and fluids changing, etc. I bought another Q7 and did the same with it on initial post-purchase oil change. Considering what it costs to change the oil on one of these cars, you may as well do the job correctly and get all the deposits out of the system using this fine additive from Liqui Moly. Highly recommended. I am incorporating this product into the future maintenance schedule on both of our Q7 TDIs as well. Keep it clean.

I plan to keep this machine for a while, so I get a piece of mind knowing I am doing all I can to prolong engine life

I actually used this in a number of cars. A 2007 S600, 2007 Escalade and a 2010 Lexus IS 250c. It does what it says. Get some TODAY!

Easy to use

Appears to work great, however the instructions for use on the bottle are not quite right. After looking online at this product it appears that you are supposed to have the car operating temperature before using this product but it does not state so on the bottle. I do believe it works great either way and it may even work better if I would have known to use it with a warm engine.

after doing a flush with this product my coil come out much cleaner on every oil change

Used as directed, noticed no difference in my MK VI Jetta TDI

Not quite sure how well this worked, but I'm a fan of Liqui Moly and this is a cheap, easy step to take when changing your oil.

My MK6 GTI just hit over 100k miles this year. I decided I wanted to do good by the car and change all the fluids properly. This product helped me flush all the oil from the system properly before tossing in new liquimoly 5w-40 oil and a new filter. Highly recommended every few oil changes if you love your car.

This seems to have some kind of an effect... I don't *think* its a placebo. Lifter noise in my M113k engine quieted considerably after this followed by oil change, along with start up lifter chatter. Paired this flush with ceratec in new oil, car uses no oil whatsoever. It's a win in my book!