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's worth the $55. I have a Toyota sedan that is 15 years new at 160,000 miles, as a maintenance action I treated the fuel tank with one bottle of 505 CRF Fuel treatment and while parked, ran the RPMs to 3,000 and held it there for 2 minutes to burn off carbon and clean the injectors. Within half a minute or so I could actually HEAR the car running to smoother. It reminded me of tuning an out of tune guitar string, the pitch/tone of the engine changed and the whole engine sounded smoother. 6 months later, the car still starts and runs like a dream. I can't promise you the same results, but I wanted to share my results with this product. As a sidenote...if you are reading this and have a car over 120,000 dont sleep on installing new spark plugs and install a new PCV valve. On some cars the install is relatively easy and the part is only $8 and now my car no longer burns oil! no more 1qt per month burned...

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

Used product twice so far. Noticed a little increase in mpg. Plus what I am unable to see. Scotty Kilmer spoke highly of it and I trust he’s opinion. Yes it’s pricy item but I think it’s worth it. I use it twice a year.

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

I’ve used this product in multiple vehicles over the years and it has performed well. This was the first time that I ordered it with the included funnel which worked great.