Millers Extra Cool 250ml

£16.99 (+VAT)

Millers Extra Cool is a corrosion inhibitor and coolant enhancer concentrate, designed to be added to coolant to help maintain flow and reduce deposit formation in radiators and reduce coolant temperature by up to 15°C. Provides powerful corrosion protection for all metals found in engines. Can be used in motorsport applications where antifreeze is disallowed.

For full details on performance profiles and specifications please refer to the technical data sheet which can be found in the toggles below.

Millers Extra Cool engine coolant enhancer and corrosion inhibitor additive.


  • Coolant additive that reduces engine operating temperatures and provides corrosion protection.
  • Especially suited to classic and modern motorsport applications where cooling efficiency is reduced and where maximum heat transfer is required
  • Also formulated for motorsport engines that are not allowed to run conventional coolant/antifreeze Mixes with all good quality antifreezes.

Dosage Rate

1 x 250ml bottle treats 10L of water

Typical characteristics

  • Specific Gravity a 20°C: 1.172
  • Colour: Pale Yellow

Features & Benefits

  • Reduces coolant temperature by up to 15°C
  • Provides powerful corrosion protection for all metals found in engines
  • Reduces foaming and cavitation
  • Prevents hot spots in the cooling system
  • Reduces engine damage from prolonged high temperature running

Technical Data Sheet



Extra Cool Technical Sheet

Safety Data Sheet



Extra Cool Safety Sheet

Estimated dispatch time within 5 working days.

Picture for illustration purposes only. Actual parts may differ slightly in appearance.