Thread: COOLANT-WATER RATIO?

I can understand tap water not being acceptable, and can only assume rain water is no good because of impurities picked up off the roof, or atmosphere?

Originally Posted by SEEK77

Given all psts provided here, I still find it a bit confusing that the Land Rover manual specifies the following:

Engine coolant (V8i, Tdi, Mpi): Use an ethylene glycol based anti-freeze (containing no methanol) with non-phosphate corrosion inhibitors suitable for use in aluminium engines to ensure
the protection of the cooling system against frost and corrosion in all seasons. Use one
part anti-freeze to one part water for protection down to -36°C (-33°F).
IMPORTANT: Coolant solution must not fall below proportions one part
anti-freeze to three parts water, i.e. minimum 25% anti-freeze in coolant otherwise
damage to engine is liable to occur. Or a maximum of 60%.

Now Techaloy Xtra Cool Gold contains 280g/L Ethyene Glycol and recommends that 1L will make up to 15L. Even if I ran Techaloy neat (undiluted) I would still not achieve 50% anti-freeze as suggested by the manual. What's missing here is the original Land Rover concentration (mg/L) of the factory coolant. This would clear things up nicely. Any comments welcome on 'corrosion inhibitors' mentioned in the spec. They don't seem to be present in the Techaloy product I was recommended in the auto shop.

You can buy 1000g/L Ethyene Glycol coolant. That is the correct one to mix 50/50. Or you can buy the one that is "premixed" to 500g/L and just pour straight in.

Originally Posted by AndyG

I can understand tap water not being acceptable, and can only assume rain water is no good because of impurities picked up off the roof, or atmosphere?

Correct, rain water is not the same as demineralised.