505 CRO Oil System Treatment (505 CRO Oil System Treatment 12 FL OZ)

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.

Works good , real cleans. Engine is smoother and quieter

Works as advertised. Outstanding results. Best I've used.

I used this product as per directions and i think i noticed my engine being quieter. The oil was definitely very grimy afterwards.However, i changed my spark plugs and cleaned my fuel injectors after using this product and the cylinder head/valve area of the engine was very dirty full of carbon deposits still. I’m sure the product helped but it wasnt a miracle cure like some of these reviews make then out to be

Good price for a good product

I was burning a quart of oil a month in my Toyota and I drive about 8000 mi a year and the car has 60000 miles on it . So, the first thing I noticed after using the product was that the car responded much better when I pressed on the gas pedal. The car is much quicker and it’s been a month and hasn’t lost any performance. Also I have cut my oil loss 50 percent. So , I will try it again in a few months . I didn’t expect much and was very surprised with the results.

I cannot say enough about this product. It does an excellent job of cleaning the sludge off your internal engine parts. I am a mechanic and I sell auto parts for a living and I can testify that this stuff really works.

My 2012 Camry hybrid was starting to burn a little oil between oil changes - about a quart every 7000 miles. Not leaking (no oil on driveway), but burning internally. I followed the directions exactly as stated and it fixed the problem. A miracle.After the application, I drove from SC to AZ and back and did not lose a drop, and none sinse. That has been over 6 months and ~7000 miles.It is expensive and may be hard to justify if your car does not have any issues, but I will be using it every other oil change for the life of the Camry which just hit 200,000 miles.