The OAT organic red coolant life expectancy 5 years and the older blue coolant Glycol 2 yearsas Simon of sifab says above. I have fitted SiFab radiator to my TR4 1958 Morgan and I am very pleased.
Just to avoid confusion, neither of these colours is appropriate for the 2011 +4.and as John said, his is an orangey colour (just like mine) My earlier post quotes the spec in handbook which is the same as the Motorcraft superplus spec.
