Mixing and filling with True
True is the quickest fill in the lineup — no dwell time, no circulation cycle, just a clean mix and a fill. This applies to both the transparent and non-transparent (opaque) True concentrates; the mixing mechanics are identical.
Not compatible with aluminium radiators or components — voids the fluid warranty. Do not add silver kill coils, other coolants, or extra additives, and do not mix different True colours together.
Confirm the loop is leak-free first
Pressure-test or run a paper-towel leak test before you mix anything. See the leak-testing guide if you have not done this yet.
A leak found after the loop is already running coolant costs more to clean up than one found on plain water.
Next in prep
Keeping It Cool is the technical library of PrimoChill. Products ship from primochill.com.
Guides
Fluids
© 2026 PrimoChill · Made in the U.S.A.