ATS Chemical 505 CRO Oil System Treatment - 12 oz Engine Oil Additive - Cleans Sludge, Reduces Emissions, Quiet Smooth Idle & Restores Performance in High-Mileage Gas & Diesel Engines

It improves the engine life, and clean all residue of sticky oil and dirt.

I have a 2016 Jeep Cherokee with 330,000 miles. After amazing results using ATF Chemical 505 CRF Fuel System Treatment (see separate review), I ordered this ATF Chemical 505 CRO Oil System Treatment. I believe my results are of particular interest because I did not perform the treatment by adding the product to dirty old oil, as you would right before an oil change, but I added the product to fresh clean oil right after an oil and filter change. Wait till you see what happened. The instructions say to add the product to your engine's oil, run the engine at "high idle" (some mechanics say @ 2,000 RPM) for 10 minutes or more, then drain the treated oil, remove the oil filter and install a new filter and new oil. However, what I did was last night I added the product to the fresh oil that was in my car, ran the engine at regular idle speed (say 750 RPM) for 10 minutes, turned off the engine and let it sit overnight. This morning I started the engine and moderately drove the car (2,000 RPM max) for 40 minutes, parked the car and let it sit for a few hours, then drained the oil. I was very curious to see what the oil looked like when I drained it. Would it look like the brand new oil that I had just put in the car? The answer is an emphatic NO - the oil was PITCH BLACK - it looked like old oil coming from an engine that was overdue for an oil change. In my opinion this stuff does what it was designed to do. It cleaned out the built-up carbon deposits internal of my engine. After installing a new filter and new oil I drove the car today as normal for about 90 minutes around town and highway. It is probably too soon to tell but I think the engine runs smoother and quieter. I will now be using these products on all my vehicles (5 cars/trucks, 4 motorcycles) and recommending this product to everyone. I am SO glad I found out about these products from a mechanic on YouTube who says these are "products your mechanic does not want you to know about" and that they will "make your vehicle last 3x longer". I have no doubt this is so. Easy to use. Does as advertised. Worth every penny.

I haven’t used it yet, but the product comes with very high recommendations

decided to use it on my 2010 Honda Pilot. I added it to the engine and let it idle for 15 minutes at approximately 2,000 RPM. Afterward, I changed the oil and filter and switched to Valvoline Restore & Protect.The product was added to oil that had only 1,500 miles on it and still appeared clean. However, when I drained the oil, it came out pitch black, suggesting that the product removed a significant amount of deposits and contaminants from the engine.

I tried just about every fuel injector cleaner on the market and nothing works better or even as good as this product. Before I use that, I pulled a couple of spark plugs out and stuck a Boro scope in the spark plug hole to look at the cylinders and the top of the pistons. There was definitely carbon buildup. I put about 10 gallons of gas in the car with one bottle of this and drove it till the tank was almost empty continuously and then after the engine cool down, I pull the same spark plugs out of the same cylinders and the difference was like night and day. Very, very clean with hardly any carbon buildup whatsoever. It cost more than the other cleaners on the market, but like they say you get what you pay for and there is nothing that comes close to this product.