toopy
Club Member
Pre-mixed is obviously more convenient, I believe they use distilled water for this, so much better than hard London tap water.
I have used pre mix on other cars, but for the last 5 years on the Datsun, i have made the effort to use the concentrate mixed with RO water (reverse osmosis) I used to have a large marine aquarium and RO water was a must, its 99.99% pure!
I think far more important is not so much which one you use, but how regular you change/flush the coolant, not using hard water helps, but if your changing it every two years anyway, its far less of an issue
I have used pre mix on other cars, but for the last 5 years on the Datsun, i have made the effort to use the concentrate mixed with RO water (reverse osmosis) I used to have a large marine aquarium and RO water was a must, its 99.99% pure!
I think far more important is not so much which one you use, but how regular you change/flush the coolant, not using hard water helps, but if your changing it every two years anyway, its far less of an issue