Rislone High Mileage 4 6 8 Compression Repair is a concentrated proprietary blend of petroleum additives developed for higher mileage engines that are suffering from decreased or uneven compression. Low compression can be caused by normal engine wear and decreased sealing between the piston rings and cylinders walls.
- Restores lost compression
- Repairs blow-by
- Frees sticky rings
- Viscosity improver
- Use on any gasoline or diesel engine




















J. Jewell –
I have a Ford 5.4 Triton that overheated and has close to 300K mi on it. The engine still runs flawlessly but I’m guessing due to the overheat event I blew a piston ring. There was a ton of smoke that pours out. I put 2 bottle of this stuff into my engine. I still have smoke, but it is definitely significantly less. So if I had normal piston ring wear I’m sure the difference would be huge, but I firmly believe one or 2 of my rings are fully damaged. Either way, it does work. Your results will depend on the severity of your situation. Don’t expect it to make the engine brand new that’s all I’m saying. Overall good product
John H –
I have a old LS truck engine on a airboat it gets run pretty hard every weekend. I was using about a qt of oil every trip. I used this and I’m getting 2 trips to the river out of a qt. So seems to of helped some.
Adam –
I used this in both my vehicles and noticed a little more power in both 2011 Chevy aveo 104k and 2007 f150 230k miles.
R. Brown –
Works fairly well if you follow the directions specifically. Recommended this product to a friend because of prior use and the effectiveness ash’s they didn’t follow the directions correctly and plugged up the radiator and the intake manifold. It was a four cylinder vehicle and they dumped the whole bottle into a warm radiator. Bad news for them. Didn’t flow through the motor as it should have abs just stuck in the radiator and what did travel wadded up in the intake manifold. Come the directions carefully and this product does work. It’s not a lifetime fix. It’s a temporary fix. But could last awhile longer. Been a mechanic for many many years and was surprised how well it did work.
Charles J Wemken –
My 2003 Dodge Ram 1500 truck with 225000 miles on the original engine started missing on the #1 cylinder. After using the Rislone it now runs fine. Give it a try for yourself.
william sanders –
I have a 1984 Simplicity 7116 lawn mower with a Briggs and Stratton 16 HP engine. The engine would burn a pint of oil and foul the spark plug after 30 minutes of use. I could no longer get a cylinder assembly for a reasonable price and I tried other oil products with no change. I put 8 ounces of the Rislone High Mileage Compression Repair in a 40 ounce oil sump on the engine. Ran the engine for over an hour. The smoke reduction was almost immediate. The engine ran smooth the entire time and would accelerate much quicker with minimal smoke. Check the oil and there was no consumption. Check the plug and it had very minimal fouling. The engine also starts right up as in the past. Praise God for repairing the engine. I almost sold the mower for parts. Hard to get rid of something you have had for 37 years. The oil additive really works, at least for now. I am believing it will continue to work well in the next few years.
Stephen –
Love thisWorks.greatEliminated all oil smoke
salvador –
I feel the engine with more power