In all purposes these additives are mechanical bandaides ,these generally are only their to help your current issue short term ,not a cure in most cases .This was mine and I was knowingly going into it with that thought in mind, it proved it was short term in this case .Rather than take a cans word for it I was skeptical like all of you out their when it comes to miracle additives ,this one was a case a few yrs ago and I decided to do a little test.The motors health was not good at all ,an 1983 617 turbo motor 300cd I had purchased with a no start issue ,2 cylinders were reading poorly around 180 that I found out after doing a thourough check list on all assoc. no start problems ,BOUGHT ENOUGH OIL FOR 2 OIL Changes and 2 cans of risolone engine compression restore .First oil change with filter was to get any washed out oil with diesel out of the crankcase. No start , next was to pull ,refill with the risolone product added to the oil and it worked .To endorse is not my intention but to inform ,my guess these products sell to what some may decide is a good deal less than a rebuilt motor ,the problem is the car maybe resold to an individual unknowing it could be a lemon ith these helper additives so be aware and thats my interntion to inform and not sit as an advocate.In other cases it will clean internal issues as in some cases with trannies,this could be long term but again its usually a trans that was not taken care of that is being assisted. .If you were to gather and study each can its mind knumbing but to realize as cars and motors get older its likley someone has relied on these products and its best to keep it in mind .Does it work ,the answer is yes and no ,in some cases, but at a cost and only short term.
The motor was pulled after giving up a yr later and I replaced it with a healthy one .