--- product_id: 650702802 title: "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" brand: "ats chemical" price: "97046CFA" currency: XOF in_stock: true reviews_count: 5 category: "Ats Chemical" url: https://www.desertcart.sn/products/650702802-ats-chemical-505-cro-oil-system-treatment-12-oz-engine store_origin: SN region: Senegal --- # Reduces emissions & sludge Restores engine smoothness 12 oz precision dosing 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 **Brand:** ats chemical **Price:** 97046CFA **Availability:** βœ… In Stock ## Summary > πŸ› οΈ Unlock your engine’s hidden potential β€” don’t let sludge steal your ride! ## Quick Answers - **What is this?** 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 by ats chemical - **How much does it cost?** 97046CFA with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/650702802-ats-chemical-505-cro-oil-system-treatment-12-oz-engine) ## Best For - ats chemical enthusiasts ## Why This Product - Trusted ats chemical brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Emission Reducer:** Cuts harmful emissions for a greener, compliant ride - β€’ **Friction Fighter:** Enhances lubrication to reduce wear and extend engine life - β€’ **Quiet Power Boost:** Smooths idle and quiets noisy high-mileage engines - β€’ **Deep Carbon Cleanse:** Dissolves stubborn sludge & varnish for a like-new engine feel - β€’ **Universal Compatibility:** Safe for gas & diesel engines, perfect for your fleet or daily driver ## Overview The 505 CRO Oil System Treatment is a 12 oz engine additive designed to clean internal deposits like sludge and varnish, improve lubrication, reduce emissions, and restore smooth, quiet performance in high-mileage gas and diesel engines. Trusted by professionals and enthusiasts alike, it’s easy to use and proven to extend engine life while optimizing efficiency. ## Description The 505 CRO Oil System Treatment (12 FL OZ) is an automotive product designed to improve the performance and longevity of your vehicle's engine by enhancing its oil system. This treatment typically works to: Clean and Protect: Helps remove sludge, varnish, and other deposits that can accumulate in the oil system, keeping it clean. Lubrication Improvement: Enhances the oil's ability to lubricate moving parts, reducing friction and wear. Performance Optimization: Improves overall engine performance by ensuring smoother operation. Compatibility: Usually safe for use with various types of engine oils and vehicles, though specifics should be checked on the product label. How to Use: Read the Label: Always follow the manufacturer's instructions provided on the product. Warm Up the Engine: Run the engine to bring it to normal operating temperature. Add Treatment: Pour the treatment directly into the oil system, either during an oil change or as specified by the product. Drive Normally: Let the product circulate through the engine to clean and enhance the system. *Due to regulation clarity we will transitioning to plastic bottles with the same unbeatable carbon dissolving formula! Review: It improves the engine life, and clean all residue of sticky oil and dirt. Review: 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. ## Features - Sticking piston rings - Sticking lifters - Sticking camshaft phasers - Sticking oil control valve - Sticking timing chain tensioner - Restricted lubricating screens ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CYXTJ8P6 | | Best Sellers Rank | #85,788 in Automotive ( See Top 100 in Automotive ) #339 in Oil & Fluid Additives | | Brand | ATS Chemical | | Customer Reviews | 4.7 4.7 out of 5 stars (379) | | Date First Available | 30 March 2024 | | Item Weight | 318 g | | Item model number | DSI1040 | | Manufacturer | ATS Chemical | | Manufacturer Part Number | 1040 | | Model | 505CRO | | Product Dimensions | 15.24 x 5.59 x 5.59 cm; 317.51 g | ## Images ![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 - Image 1](https://m.media-amazon.com/images/I/61nqOcAbPFL.jpg) ![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 - Image 2](https://m.media-amazon.com/images/I/81P5KWBmmuL.jpg) ![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 - Image 3](https://m.media-amazon.com/images/I/71QRrPNrqUL.jpg) ![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 - Image 4](https://m.media-amazon.com/images/I/71DAAsKGSCL.jpg) ![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 - Image 5](https://m.media-amazon.com/images/I/812FEXXfFlL.jpg) ## Available Options This product comes in different **Part Number, Model, Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by O***O on 25 October 2024* It improves the engine life, and clean all residue of sticky oil and dirt. ### ⭐⭐⭐⭐⭐ Review *by B***. on 4 February 2025* 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. ### ⭐⭐⭐⭐⭐ Review *by P***L on 4 December 2025* 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... ## Frequently Bought Together - ATS Chemical 505 CRO Oil System Treatment (505 CRO Oil System Treatment 12 FL OZ) - ATS Chemical 505 CRF Fuel System Treatment, 16 fluid ounces - ATP Automotive AT-205 Re-Seal Stops Leaks, 8 Ounce Bottle --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sn/products/650702802-ats-chemical-505-cro-oil-system-treatment-12-oz-engine](https://www.desertcart.sn/products/650702802-ats-chemical-505-cro-oil-system-treatment-12-oz-engine) --- *Product available on Desertcart Senegal* *Store origin: SN* *Last updated: 2026-05-18*