Denny ,You're right. It is risky. I was willing to take the gamble and so far it has worked out for me. Knock on wood. I use to sell Wynns Extended warranties with the cars I sold .They would give an additive kit for everything in the car. Engine,trans, rearend, A.c. power steering,cooling system etc. This stuff must have been 3 times better than most additives that you could buy locally It worked . I dont think their across the counter products even compared to this. Thats what I put in my trans at 120k and just did it again recently.Its been on borrowed time and it may fall out in 7 more hours when I have to tow our Church trailer.Oh well!