Rislone 4447-12PK High Mileage Compression Repair with Ring Seal - 16.9 oz, 12-Pack

I have a 1989 boat. The engine is the Mercruiser 4-cylinder Alpha One. The engines were actually made by General Motors. They were used in Chevys, and they adapted them for marine use by putting their own intake manifolds and exhaust manifolds on them.I would note that marine engines have a hard life. They are frequently run wide open at 4,000 RPMs for long periods of time, causing more wear than the same engine in a car would experience.So, my engine was 34 years old and very tired. Starting was unreliable. It would crank and crank until it would catch, and then I had to keep the rpms at about 3,000 for a while or it would die.You could tell one cylinder was not firing- maybe two because of the lumpy running and engine shaking. Idling was out of the question for at least 5 minutes. If other people were at the boat ramp I felt embarrassed because of all the blue smoke my boat made.I decided to add one container of this product to my oil to see what would happen. The first four times I started the engine, there was no change. About the fifth time, I noticed it was running more smoothly.Then, after about a month, I accidentally started the engine without giving it any throttle- I just turned the key. It started right away (miracle #1) AND idled smoothly at 700RPM (miracle #2).I could not believe it! I turned it off and started it again, and the same thing happened. Since then, it has done this every time. No blue smoke, no engine shaking, engine starts immediately and idles smoothly.That's my story. I don't know what they put into this product, but whatever it is it actually works. It restored my balky, high-mileage engine so it now starts and purrs like a baby. I would highly recommend this product, and that's an understatement.

2007 H3 Hummer 186,000 milesThese 2 products (Look at uploaded picture) ACTUALLY WORKED. It was at 309 miles exactly of driving after a fresh oil change + these 2 oil additives-the check engine light went off and stayed off.The Hummer is an oil burner so I added another half quart of “ring seal”, check engine light is still off.* Rislone “ high mileage compression repair with ring”* Rislone “ high mileage Ring Seal Smoke Repair”___________________________________________Below was my issues and what I’ve tired to get the check engine light off.Aggressive HEAVY IDLING - Blue Smoke blowing out exhaust on start - - a mechanic said I blew a head gasket and that was going to cost $7000 to replace it or $12,000 for a new engine.I Changed 8 sensors - changed spark plugs and engine coils, check engine light was still on, I changed all the fuses. I cleaned the throttlebody, I made everything sure all was airtight sealed. I got some type of spray cleaner and sprayed it into the main PCV hose (90degree angle one).Nothing F’ing workedNow after the additives….My car almost runs like brand new and purrrrrrrs like a cat, I get better gas mileage, there’s no more heavy, rumbling or shaking.I’ll be adding these two additives every oil change.

Great product notice results immediately purchased more for Kubota tractor and John Deere and Chevy truck

Works as advertised, smoothed out engine. Used in lawn tractor.

Bought a can for my okd Subaru Forester when it developed compression issues. Although it didn't cure the issue, it did help noticeably. I couldn't have aAdked any more of it for the price.

Excellent product. Worked wonders on my 164k Honda v6. Get it.

I use this in a 97, 7.3 power stroke. Over 300,000 miles, it stopped the oil leaks from the o-rings on the Turbo housing and from hpop. Seemed to help cold start ups. I have low compression on all cylinders but I don't think this helped with increasing compression, but I will use again.

Does not work