A friend bought this for a Mitsubishi eclipse that I had just bought. I put a lot of money into the transmission. Believing what I was told, that the engine was solid. To trusting in my part, yes. But, I had a friend/coworker who was there when I got it out of the shop from the transmission work. He checked it out, drove it and then gave me the hard truth. The engine was NOT solid. The rings and pistons were shot/warped. It was blowing smoke and did not sound good at all. He then told me about this engine treatment that he’s used countless times for years. Keep in mind he is our mine mechanics superintendent. He said it’s not cheap but, it’s worth it. He has used it in industrial farm machinery he’s owned and bought, he’s put it in his vehicles, equipment that was deemed useless and unrepairable. And every time it’s gave him 1000’s of miles of usage. So, he bought a treatment and put it in my car. I will tell you he did do it differently than their instructions say. But holy cow if it didn’t work. You could tell right away there was a small improvement. But by 100-200 miles. WOW it just got better. My car was bulletproof!! And I have purchased the engine treatment 4 times for different vehicles (for my kids) 2 transmission treatments and 1 ac blue treatment. Never have I been disappointed.