I installed this on
Audi TT

Review
This is what my mechanic had recommended me. So far it's been around 15,000 kms since flushing and refilling my radiator, and my car's headgasket is still intact, and there have been no overheating issues. If you get the undiluted stuff like I did, you will likely save some money as distilled water is a dollar per gallon at most. Then you'll still have some of these left over to add if/when necessary. In conclusion, this works with, of course, no explosions.

What I like
Had improved the condition of my car after my recent servicing.

What I do not like
I think its availability is really scarce since I had a hard time finding it.