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.
Morgans 1934 MX, 1947 Series 1, 1956 +4 TR4, 2000 +4 T16 Triumph Herald 1969 13/60 Morris 1970
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