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Your cart is empty.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.
david teague
September 3, 2025
Risoline product work, have used for years, fast shipping, will buy again. Thanx Amazon....
Corey Umstott
August 14, 2025
If you're here this is probably your last resort. It's not going to fix your problem but it may extend your engines life to get you down the road a bit longer. Definitely made our failing engine run quite and smoother. No noticeable increase in compression.
Bryan Anderson
August 6, 2025
Let me say right off I am not a believer in snake oil treatments to cure mechanical issues on a car. If you are considering buying this because your car smokes like a freight train you are probably going to be disappointed. I bought a 2009 Pontiac Vibe off of a neighbor and was told it was using oil. I knew enough about the car to know it is really a Toyota Matrix in Pontiac clothing. Yes, it has the 2.4l engine (can’t remember the code) that is known to have a design flaw in the piston that causes oil use. I think this is made worse by people trying to go 15k miles between oil changes. This car had all those afflictions. It appeared to be using oil about a quart every 400 miles when I got it. After 3 quick oil changes and two treatments of this stuff it is using way less than half of that. I doubt this vehicle will ever go 3000 miles without adding oil, I just don’t want to tear the engine down for new pistons and rings(what this engine really needs). Maybe this stuff works, or maybe the quick oil changes are cleaning some of the carbon out. Your guess is as good as mine. But either way I will get to use the car for what I hoped, giving my daughter a cheap vehicle to learn to drive in so she don’t run our better vehicles into a ditch lol! So I am pretty happy.
E. Paul
July 11, 2025
I bought my 2009 SUV with 85,000 miles and now has 120,000. It has shaken at idle since the day I bought it. I've spent a lot of money replacing all the parts I thought could be causing it. Nothing worked. I knew I had low compression at 95 psi in one of my cylinders but thought there was nothing I could do except rip apart the engine and fix it. I did not know until a week ago that there was an oil additive I could add to see if it improved the performance of my engine. I added the compression additive to my engine oil and went for a ten minute drive. When I got home and parked in my garage there was just a little engine shaking and no more engine pinging. My engine would rattle my car to where it would spill water sitting in a cup in the cup holder. Now there is just a very slight shimmy. The difference is night and day! This stuff is awesome!!!! Edit: I just went on a two hour drive through the city and highways. I filled up the tank with regular gas. I got 31mpg after driving 130 miles. I've been getting 19-22 mpg and the best I ever got was 24mpg. This stuff is just amazing!
Ed
July 9, 2025
I tried this as a last attempt to reestablish compression in a cylinder. Like most oil additives it did not work, but it also did not hurt anything.
william sanders
June 24, 2025
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.
C. R.
May 3, 2025
We bought the Rislone High Mileage 4 6 8 Compression Repair to use in our riding mower. It wasn't running right and we decided to give this a try. It did seem to help. It is really thick and kind of sticky.
Nick
April 16, 2025
car smokes even more than before, also engine started to vibrate pretty bad
Peter Busciglio
March 23, 2025
I noticed after less than 100 km increased power the slight engine ticking noise gone!
Kevin Harris
February 1, 2025
Purchased this in desperation as my motorbike had lost compression in one of its cylinders so it was this stuff or bike sold as spares and repairs . Used 3/4 of the bottle and the bike is running like new..... can't fault it!!!!
Jom
January 21, 2025
Performs well and significant results after 150KM+ drive.
Kunde
January 9, 2025
Ok
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