Finol CoolTemp Ultra SI-OAT RTU – Premixed Long-Life Engine Coolant & Antifreeze

Finol CoolTemp Ultra SI-OAT RTU is a ready-to-use, long-life engine coolant formulated with monoethylene glycol and Silicated Organic Acid Technology (SI-OAT). Supplied premixed, it is designed to provide dependable year-round protection for compatible petrol and diesel engine cooling systems without the need for additional dilution.

The SI-OAT formulation combines organic corrosion inhibitors with silicate protection to help safeguard cooling system components against corrosion, cavitation, freezing, overheating and deposit formation. This makes it a suitable option for a wide range of modern vehicles, commercial fleets, agricultural machinery, construction equipment and industrial engines where the required manufacturer specification is met.

Key Features

• Ready-to-use coolant – no dilution required
• SI-OAT (Silicated Organic Acid Technology) formulation
• Monoethylene glycol based
• Long-life engine coolant and antifreeze
• Year-round cooling system protection
• Helps protect against freezing and overheating
• Corrosion and erosion protection for cooling system components
• Helps protect water pumps against corrosion and cavitation
• Designed to minimise scale and deposit formation
• Suitable for compatible aluminium and mixed-metal cooling systems
• Convenient solution for workshops, fleets and machinery operators

Where Can Finol SI-OAT RTU Coolant Be Used?

This premixed coolant is intended for compatible cooling systems across automotive, commercial and off-highway applications.

Typical applications include:

• Passenger cars and SUVs
• Petrol and diesel engines
• Light commercial vehicles
• Trucks and heavy-duty vehicles
• Buses and coaches
• Agricultural tractors and machinery
• Construction and plant equipment
• Industrial engines
• Fleet vehicles
• Workshop and maintenance applications

For vehicles with specific coolant requirements, always check the manufacturer's recommended coolant specification before filling or topping up.

Cooling System Protection

Engine coolant does much more than prevent freezing during cold weather. The correct coolant also plays an important role in maintaining the cooling system and protecting components from corrosion and deposits.

Finol CoolTemp Ultra SI-OAT RTU is formulated to help protect radiators, water pumps, engine blocks, cylinder heads and other cooling system components from corrosion and cavitation. Its premixed formulation also removes the need to calculate antifreeze and water ratios during routine coolant changes or top-ups.

Ready-Mixed for Workshop Convenience

Because this product is supplied ready to use, it can be added directly to a compatible cooling system without mixing concentrate with water first.

This can be particularly useful for:

• Commercial vehicle workshops
• Agricultural machinery maintenance
• Fleet operators
• Plant and construction businesses
• Garages
• Industrial maintenance departments

Do not dilute the product unless the product or equipment manufacturer specifically instructs otherwise.

Specifications & Performance Requirements

Finol CoolTemp Ultra SI-OAT RTU is listed in connection with the following specifications and requirements:

• AFNOR NF R 15-601
• ASTM D3306
• ASTM D4985
• BS 6580:2010
• SAE J1034
• CUNA NC 956-16
• VW TL 774-G (G12/G12++)
• Mercedes-Benz MB 325.5 / MB 325.6
• MAN 324 Type Si-OAT
• Cummins CES 14603
• Scania TB 1451
• TSIO/C2153/BG40

Important: coolant specifications and manufacturer requirements can vary between engines and model years. Always confirm that the required specification is suitable for your particular vehicle or equipment before use. Coolant colour alone should not be used to determine compatibility.

Why Choose Finol CoolTemp Ultra SI-OAT RTU?

Choosing the correct coolant helps protect both the engine and the wider cooling system. Finol CoolTemp Ultra SI-OAT RTU combines long-life SI-OAT technology with the convenience of a premixed coolant, making it a practical choice for professional maintenance and routine servicing.

It is particularly useful where a ready-to-use coolant is required for modern vehicles, agricultural machinery, commercial vehicles or compatible heavy-duty equipment.

Buy Finol CoolTemp Ultra SI-OAT RTU from Conlan Oils

With over 40 years of experience supplying oils, lubricants, tools and workshop products, Conlan Oils can help you source the right coolant and antifreeze for your vehicle, machinery or equipment.

If you are unsure which coolant specification your engine requires, contact our team before ordering. Providing the vehicle or equipment make, model and existing coolant specification can help us identify a suitable product.

Need a Product You Can't Find Online?

If you can't find the product you need on the Conlan Oils website, contact our team. We can often source and order products that aren't currently listed online and may be able to help you find a suitable option for your requirements.

Call 059 8632494 or email enquiry@conlanoils.com to check availability, pack sizes and ordering options.

Click & Collect is available during all shop opening hours

FREE delivery for all order over €150 inc Vat placed online in Ireland, This excludes BULKY ITEMS (Pallet deliveries) T&C apply. 

If you place an order online, we will contact you if any of your items are out of stock with current lead times or alternatives if suitable.

Your product is covered by a 12 month Warranty or more if you opted for the extended warranty. Make sure you register your product.