Request a catalogue

Available Catalogues

I'm interested in:
  • Motorsport
  • Motorcycle
  • Performance
  • Tools and Workshop

Brand

  1. Design Engineering (4)
  2. Frost (1)
  3. Lucas Oil (1)
  4. Millers Oils (2)
  5. Mishimoto (1)
  6. Motul (2)
  7. Red Line (4)
  8. Ring (1)
  9. VP Racing (1)
  10. VR-12 (1)
Show Less

Size

  1. 118ml (1)
  2. 2 Quart (1.9 Litre) (1)
  3. 250ml (1)
  4. 3.78 Litre (2)
  5. 1 Litre (2)
  6. 20 Litre (1)
  7. 355ml (1)
  8. 473ml (7)
  9. 5 Litre (2)
  10. 500ml (1)
  11. 60 Litre (1)
Show Less

Price

NZ$7 NZ$105

Brand

Showing All

Size

Showing All

Price

Showing All

Coolant Additives

Showing 18 of 18 items
Filter
Red Line Water Wetter Super Coolant
NZ$31.42 Ex VAT NZ$31.42 INC VAT
Ring UV Dyes
From NZ$7.05 Ex VAT From NZ$7.05 INC VAT
VR-12 Coolant Additive
NZ$22.84 Ex VAT NZ$22.84 INC VAT
Motul Mocool Coolant Additive
NZ$25.03 Ex VAT NZ$25.03 INC VAT
VP Racing Madditive Cool Down
NZ$24.72 Ex VAT NZ$24.72 INC VAT
Millers Oils Extra Cool
NZ$23.07 Ex VAT NZ$23.07 INC VAT
Frost Stay Cool Coolant Additive
NZ$28.48 Ex VAT NZ$28.48 INC VAT
Motul Auto Cool G13 Ultra Coolant (Concentrate)
From NZ$95.42 Ex VAT From NZ$95.42 INC VAT
Millers Oils Red Alpine Anti Freeze Summer Coolant
From NZ$7.09 Ex VAT From NZ$7.09 INC VAT
Design Engineering Chill Charger
NZ$18.17 Ex VAT NZ$18.17 INC VAT
Lucas Oil Super Coolant
NZ$25.89 Ex VAT NZ$25.89 INC VAT
Design Engineering Heater Hotter
NZ$18.17 Ex VAT NZ$18.17 INC VAT
Mishimoto Radiator Coolant Liquid Chill
NZ$37.78 Ex VAT NZ$37.78 INC VAT
Design Engineering Radiator Relief Flush
NZ$18.17 Ex VAT NZ$18.17 INC VAT
Design Engineering Radiator Relief
NZ$17.97 Ex VAT NZ$17.97 INC VAT
Showing 18 of 18 items
Filter

Additives are some of the most effective, yet frequently overlooked fluids you can put into a car. Coolant additives, in particular, are often forgotten in favour of the more widely used fuel and oil treatments, but they play a vital role in motorsport.

As a natural by-product of their operation, car engines produce a large amount of heat. In racing conditions, as you can imagine, the engine gets very hot indeed and is often at risk of overheating leaving you forced to retire from the race or back to the pits for some urgent work.

To combat this increase in heat and to maintain the perfect operating temperature, most engines feature a cooling system which pumps a special fluid around the inside of the engine and through a radiator. As regular water starts to boil at 100 degrees Celsius, either ethylene or propylene glycol is added to lower the boiling point and keep the fluid more stable. In order to keep your engine at a cool operating temperature and working how you want it to from lights out to the chequered flag, browse the full range of engine coolant additives available at Demon Tweeks today featuring additives from Red Line, Motul, Millers Oils and more top brands.