ATS Chemical 505 CRO Oil System Treatment — 12 oz Engine Oil Additive for Sludge Removal, Emissions Reduction & Quiet Idle

ATS Chemical 505 CRO Oil System Treatment is a 12 oz engine oil additive formulated to dissolve sludge, free sticky valvetrain components, reduce emissions, and help restore smooth idle and performance in gas and diesel engines.

Designed for use during an oil change or added to existing oil, this concentrated formula targets varnish and deposits that build up in high‑mileage engines. It works with conventional and synthetic lubricants and is meant to address common oil‑system blockages without requiring disassembly. Use as directed to improve oil flow, reduce mechanical noise, and help the engine run more efficiently.

How does this treatment clear sludge and varnish inside an engine?

The formula contains solvents and detergents that break down hardened deposits and suspend loosened sludge so it can be drained out with the old oil. It loosens sticky rings and lifters by dissolving varnish that restricts movement, helping restore normal oil circulation.

• Solvent action dissolves baked-on varnish and softens sludge.
• Detergents suspend contaminants for removal during the oil change.
• Compatible with most gasoline and diesel engine oils when used per instructions.

Will ATS Chemical 505 reduce smoke and lower emissions?

By cleaning oil passages and freeing sticking components, the treatment can reduce oil burning and incomplete combustion that contribute to visible smoke and higher tailpipe emissions. Results depend on the engine’s condition; severe internal damage may limit improvement.

• Helps reduce oil consumption that causes blue smoke.
• Improves oil flow to emission‑sensitive components such as phasers and control valves.
• Can contribute to steadier combustion when deposits are the primary cause.

Can this product quiet noisy lifters, cam phasers, and rough idle?

Yes—clearing varnish and restoring oil pressure to valvetrain components often reduces tapping and rattling noises and smooths idle. It’s most effective when noises are caused by restricted oil flow rather than worn mechanical parts.

• Frees sticking piston rings, lifters, and phasers to improve movement.
• Restores operation of oil control valves and timing chain tensioners.
• Reduces noise by improving lubrication and hydraulic actuation.

How should I use the 12 oz bottle and when will I see results?

Add the recommended 12 oz dose to the crankcase during an oil change or into warm running oil as instructed on the label. Allow the engine to run for the specified soak period before draining so solvents can work; some users notice quieter operation and better responsiveness after one treatment, while heavier deposits may require repeated use.

• Use one 12 oz bottle per specified oil capacity—follow label dosing.
• Run engine for the manufacturer’s recommended soak time before draining.
• Repeat at intervals if severe deposits are present or as preventive maintenance.

Who is this for: ATS Chemical 505 CRO is intended for owners and technicians servicing high‑mileage or deposit‑laden gasoline and diesel engines who want to address sticking valvetrain parts, reduce oil‑related smoke, and recover smoother idle and performance without teardown. It’s suitable for vehicles showing symptoms of restricted oil flow—noisy lifters, sluggish phasers, or elevated oil consumption—but not a substitute for repairs when mechanical wear or hardware failure is present.