I am under the impression that the Toyota red premixed and Pink premixed are not compatible with the impurities in water and hence the concentrated version of red. I am now wondering if there is also a pink concentrate that I was not aware of. Everytime I think I have found a link to a technical data sheet I manage to find a page not available message or security warning. I am simply guessing that red pre mixed is OAT.

Oh how simple life used to be when you just bunged in anything marked antifreeze.

I am sure if I had I would know. I tend to think these people are busy and don't need people like me bothering them. I am sure someone on here will simply say at some point "oh yes no probs". I tend to think this is why we use forums. I find the previous reply interesting in that OAT concentrated obviously is mixed with water making me wonder why I read that pre mixed OAT should not come into contact with water. Oh my brain hurts.

My 10-year-old Peugeot diesel still has its original coolant, which has been topped up once, and its colour (blue) is still unchanged, so I shall probably leave it in until it shows signs of change.

Very wise. Why on earth would you want to change coolant every 3 years? Only someone with no chemical knowledge would do this.

Our 17yr old 130,000m Focus 1.6 Zetec still has its original coolant, topped up once, and its colour (pink) is unchanged. If you replace it, you will introduce fresh oxygen (dissolved in the water component of the coolant) thus facilitating internal corrosion until it is used up.

Yep yokel138 you have it spot on. Main dealer said exactly the same.

Thing is I originally just glanced at the overflow tank and thought that looks red to me plus I had recently read an article saying how wonderful red was. When I actually drained it I realised I had purchased a deep red colour as opposed to pink.

Now I have nothing to worry about I am just going to have to think of something else.

So refreshing when someone knows what they are talking about as opposed to quoting personal opinion as fact. I find this site quite good in this respect.

Thank you