--- product_id: 619551641 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" price: "€ 111.04" currency: EUR in_stock: true reviews_count: 11 url: https://www.desertcart.gr/products/619551641-ats-chemical-505-cro-oil-system-treatment-12-oz-engine store_origin: GR region: Greece --- # Cuts emissions sharply Restores engine parts 12 oz precision dose 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 **Price:** € 111.04 **Availability:** βœ… In Stock ## Summary > πŸ› οΈ Unlock your engine’s hidden potential β€” drive cleaner, smoother, stronger! ## 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 - **How much does it cost?** € 111.04 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/619551641-ats-chemical-505-cro-oil-system-treatment-12-oz-engine) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Emission Reducer:** Lowers harmful exhaust for eco-conscious driving - β€’ **Deep Sludge Cleaner:** Dissolves stubborn deposits for peak engine health - β€’ **Performance Restorer:** Revives power in high-mileage gas & diesel engines - β€’ **Smooth Idle Enhancer:** Quiets engine noise for a refined ride - β€’ **Comprehensive System Fix:** Targets piston rings, lifters, cam phasers & more ## Overview ATS Chemical 505 CRO Oil System Treatment is a 12 oz engine additive designed to clean sludge buildup, reduce emissions, and restore smooth idle and performance in high-mileage gas and diesel engines. Trusted by thousands with a 4.6-star rating, it targets critical engine components like piston rings and camshaft phasers to extend engine life and improve efficiency. ## Description Buy 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: Fuel Additives - desertcart.com βœ“ FREE DELIVERY possible on eligible purchases Review: First-hand evidence proves product very effectively cleans carbon build-up internal of your engine - 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: Works great! - This is a great product! ## 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 | #5,702 in Automotive ( See Top 100 in Automotive ) #42 in Engine & Oil Fluid Additives | | Brand | ATS Chemical | | Customer Reviews | 4.6 4.6 out of 5 stars (325) | | Date First Available | March 24, 2024 | | Item Weight | 11.2 ounces | | Item model number | DSI1040 | | Manufacturer | ATS Chemical | | Manufacturer Part Number | 1040 | | Model | 505CRO | | Product Dimensions | 6 x 2.2 x 2.2 inches | ## 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) ## Available Options This product comes in different **Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ First-hand evidence proves product very effectively cleans carbon build-up internal of your engine *by B***. on February 4, 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. ### ⭐⭐⭐⭐⭐ Works great! *by D***D on July 28, 2026* This is a great product! ### ⭐⭐⭐⭐⭐ Fantastic and It did clean *by A***N on June 2, 2026* 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. ## 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.gr/products/619551641-ats-chemical-505-cro-oil-system-treatment-12-oz-engine](https://www.desertcart.gr/products/619551641-ats-chemical-505-cro-oil-system-treatment-12-oz-engine) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-08-29*