Coolant / Antifreeze (OAT Technology)
Greyhound Lubricants’ Coolant / Antifreeze OAT G12 EL (Extended Life) is a high-performance engine coolant formulated using Organic Acid Technology (OAT) to provide reliable temperature control and long-term corrosion protection. It circulates through the engine to maintain stable operating temperatures under both hot and cold conditions, while protecting internal components from corrosion, scale, and deposit formation. Greyhound OAT coolant is suitable for modern aluminium and mixed-metal cooling systems in passenger vehicles, light commercial vehicles, and mixed-fleet applications.
Recommended Use:
- Greyhound Coolant/Antifreeze OAT G12 EL 25 (Summer Mix): Suitable for mild climates with freeze protection down to approximately –5°C
- Greyhound Coolant/Antifreeze OAT G12 EL 50 (Ready-to-Use): Provides freeze protection down to approximately –37°C
- Greyhound Coolant/Antifreeze OAT G12 EL 100 (Concentrate): When diluted at 50/50, provides freeze protection down to approximately –37°C (higher concentrations may increase protection to lower temperatures)
For optimal performance, systems previously filled with silicate-based (G11-type) coolants should be drained and flushed before conversion. Always refer to the vehicle manufacturer’s manual for the correct coolant specification and dilution ratios.
Application: Coolant / Antifreeze: everyday coolant top-ups and refills for petrol and diesel vehicles in warm South African regions. Ready-mixed — pour and go.
Greyhound™ G-MOTO™ Coolant / Antifreeze OAT G12 EL 25 (Summer Mix) is a ready-mixed anti-freeze & summer coolant — 25% OAT G12 coolant pre-diluted with 75% deionised water. It gives everyday top-ups real protection: corrosion inhibitors, water pump lubrication and boil-over resistance at an everyday price.
Plain water protects nothing and dilutes the inhibitors already in your system — and many cheap “summer coolants” are little more than coloured water. Summer Mix carries real OAT G12 chemistry in every litre. For inland winters or heavy towing, step up to RTU 50/50 for –37°C protection.
Specifications: Based on Greyhound OAT G12 EL chemistry (ASTM D3306 / BS 6580 family). 25% coolant / 75% deionised water pre-mix. Freeze protection to approx. –5°C — for deep freeze use RTU 50/50.
Benefits:
- Ready-mixed 25/75 anti-freeze & summer coolant — no mixing
- Genuine OAT G12 corrosion inhibitors — silicate-free
- Lubricates the water pump; raises boiling point vs plain water
- Protects aluminium, copper and cast iron against rust and scale
- Safe for modern petrol and diesel engines
- The economical warm-climate top-up
Application: Coolant / Antifreeze: petrol and diesel engines in passenger cars, SUVs, light commercial vehicles and mixed fleets. Pre-diluted 50/50 with deionised water — pour straight in, do not dilute further.
Greyhound™ G-MOTO™ Coolant / Antifreeze OAT G12 EL 50 (RTU 50/50) is a ready-to-use extended life coolant built on silicate-free Organic Acid Technology (OAT G12). It delivers freeze protection down to –37°C and pressurised boil-over protection above 108°C, with extended-life organic inhibitors that protect aluminium, cast iron, steel, brass and soldered joints.
Modern engines face their highest corrosion and thermal stress at cold start and sustained high-temperature operation. RTU 50/50 protects from the first pour — no mixing errors, no hard-water scale — and keeps radiators deposit-free through an extended service interval. A modern replacement for G11-type antifreeze. Also available in red, green and yellow.
Specifications: G12 extended-life OAT; ASTM D3306; BS 6580:1992 / 2010; AS 2108-2004; GB 29743-2013 LEC; NB/SH/T 0521-2010. 50% glycol (MEG); pH 7.5–8.5.
Benefits:
- Ready to use — no mixing, no dilution errors
- Freeze protection to –37°C; boil-over protection above 108°C (pressurised)
- Extended drain intervals vs G11 antifreeze
- Silicate-free — deposit-free radiators, efficient heat transfer
- Protects water pump, seals and mixed-metal cooling systems
- European formulation, produced at ISO-certified facilities
Application: Coolant / Antifreeze: petrol and diesel engines in passenger cars, SUVs, light commercial vehicles and mixed fleets. High-strength pre-blend — dilute with deionised water to the protection level required.
Greyhound™ G-MOTO™ Coolant / Antifreeze OAT G12 EL 80 is a high-strength extended life coolant pre-blend on silicate-free Organic Acid Technology (OAT G12) — 80% coolant already blended with deionised water. It gives workshops near-full-strength antifreeze that dilutes faster and more accurately than neat concentrate, with less risk of hard-water scale at mixing time.
The same extended-life organic inhibitors protect aluminium, copper, cast iron and soldered joints through an extended service interval — a cleaner, modern alternative for buyers of “96%-style” high-strength antifreeze.
Dilution guide (typical): 5 parts blend + 3 parts water = 50% (–37°C) · 1:1 = 40% (–24°C) · 1:2 = 27% (approx. –12°C).
Specifications: G12 extended-life OAT; ASTM D3306; BS 6580:1992 / 2010; AS 2108-2004; GB 29743-2013 LEC; NB/SH/T 0521-2010. 80% pre-blend with deionised water.
Benefits:
- High-strength 80% OAT G12 extended life pre-blend
- Silicate-, nitrite-, amine-, phosphate- and borate-free
- Faster, safer dilution — first blend done with deionised water
- Extended drain intervals compared to G11 antifreeze
- Protects aluminium, copper, cast iron and soldered joints
- European formulation, produced at ISO-certified facilities
Application: Coolant / Antifreeze: petrol and diesel engines in passenger cars, SUVs, light commercial vehicles and mixed fleets. Dilute with deionised water to the protection level required.
Greyhound™ G-MOTO™ Coolant / Antifreeze OAT G12 EL 100 is a full-strength extended life coolant concentrate built on silicate-free Organic Acid Technology (OAT G12) — 94% glycol (MEG) with extended-life organic inhibitors that act directly at corrosion sites, keeping radiator passages clean and heat transfer efficient through an extended service interval. A modern replacement for G11-type concentrate antifreeze.
Dilution guide (deionised water): 33% = –18°C; 40% = –24°C; 50% = –37°C; 60% = –52°C. Boiling point >190°C (neat).
Specifications: G12 extended-life OAT; ASTM D3306; BS 6580:1992 / 2010; AS 2108-2004; GB 29743-2013 LEC; NB/SH/T 0521-2010.
Benefits:
- Extended-life OAT inhibitors — extended drain intervals, less downtime
- Silicate-, nitrite-, amine-, phosphate- and borate-free
- You control the strength — coastal summers to Highveld frost
- Protects aluminium, cast iron, steel, brass and soldered joints
- Excellent water pump and seal protection
- European formulation, produced at ISO-certified facilities
Coolant / Antifreeze (Other Colours: Red, Green, Yellow)
Greyhound Antifreeze is formulated using Organic Acid Technology (OAT) to provide reliable temperature control and long-term corrosion protection across a wide range of automotive cooling systems. Colour does not indicate performance or chemical composition. Different colours are used for identification purposes only and may vary by application or customer preference. All Greyhound OAT coolants offer the same core benefits, including:
- Extended service life
- Corrosion and scale protection
- Compatibility with modern aluminium and mixed-metal cooling systems
Important: Always ensure the correct product specification is used. Do not mix different coolant types without confirming compatibility.
Application: Coolant / Antifreeze: petrol and diesel engines in passenger cars, SUVs, light commercial vehicles and mixed fleets. Pre-diluted 50/50 with deionised water — pour straight in, do not dilute further.
Greyhound™ G-MOTO™ Coolant / Antifreeze OAT G12 EL 50 Red is our ready-to-use 50/50 extended life coolant on silicate-free Organic Acid Technology (OAT G12), dyed red. Many Asian and European vehicles are factory-filled with red or pink coolant — this lets you top up or refill a red system with correct modern OAT chemistry, without imported-brand prices.
Coolant colour is a dye, not a chemistry: this is the identical OAT G12 formula as our blue RTU 50/50 — freeze protection to –37°C, pressurised boil-over protection above 108°C, and extended-life inhibitors that keep radiators deposit-free through an extended service interval.
Specifications: G12 extended-life OAT; ASTM D3306; BS 6580:1992 / 2010; AS 2108-2004; GB 29743-2013 LEC; NB/SH/T 0521-2010. 50% glycol (MEG); pH 7.5–8.5.
Benefits:
- Red-dyed OAT G12 extended life coolant — ideal for red/pink-filled systems
- Ready to use — no mixing, no dilution errors
- Freeze protection to –37°C; boil-over protection above 108°C (pressurised)
- Extended drain intervals vs G11 antifreeze
- Silicate-free — protects aluminium, water pump and seals
- European formulation, produced at ISO-certified facilities
Application: Coolant / Antifreeze: petrol and diesel engines in passenger cars, SUVs, light commercial vehicles and mixed fleets. Pre-diluted 50/50 with deionised water — pour straight in, do not dilute further.
Greyhound™ G-MOTO™ Coolant / Antifreeze OAT G12 EL 50 Green pairs South Africa’s most familiar antifreeze colour with chemistry most green coolants don’t have: silicate-free extended life Organic Acid Technology (OAT G12). Most budget green antifreeze is old IAT/G11 technology — this is the straightforward upgrade if your system runs green.
Coolant colour is a dye, not a chemistry: this is the identical OAT G12 formula as our blue RTU 50/50 — freeze protection to –37°C, pressurised boil-over protection above 108°C, and extended-life inhibitors that keep radiators deposit-free through an extended service interval.
Specifications: G12 extended-life OAT; ASTM D3306; BS 6580:1992 / 2010; AS 2108-2004; GB 29743-2013 LEC; NB/SH/T 0521-2010. 50% glycol (MEG); pH 7.5–8.5.
Benefits:
- Familiar green colour — modern OAT G12 extended life chemistry
- Ready to use — no mixing, no dilution errors
- Freeze protection to –37°C; boil-over protection above 108°C (pressurised)
- Extended drain intervals vs G11 antifreeze
- Silicate-free — protects aluminium, water pump and seals
- European formulation, produced at ISO-certified facilities
Application: Coolant / Antifreeze: petrol and diesel engines in passenger cars, SUVs, light commercial vehicles and mixed fleets. Pre-diluted 50/50 with deionised water — pour straight in, do not dilute further.
Greyhound™ G-MOTO™ Coolant / Antifreeze OAT G12 EL 50 Yellow is our ready-to-use 50/50 extended life coolant on silicate-free Organic Acid Technology (OAT G12), in yellow — the colour common to universal coolants and colour-coded mixed fleets. It keeps fleet identification consistent while upgrading every cooling system to G12 extended life protection.
Coolant colour is a dye, not a chemistry: this is the identical OAT G12 formula as our blue RTU 50/50 — freeze protection to –37°C, pressurised boil-over protection above 108°C, and extended-life inhibitors that keep radiators deposit-free through an extended service interval.
Specifications: G12 extended-life OAT; ASTM D3306; BS 6580:1992 / 2010; AS 2108-2004; GB 29743-2013 LEC; NB/SH/T 0521-2010. 50% glycol (MEG); pH 7.5–8.5.
Benefits:
- Yellow-dyed OAT G12 extended life coolant for colour-coded fleets
- Ready to use — no mixing, no dilution errors
- Freeze protection to –37°C; boil-over protection above 108°C (pressurised)
- Extended drain intervals vs G11 antifreeze
- Silicate-free — protects aluminium, water pump and seals
- European formulation, produced at ISO-certified facilities