All BMW's and Mini coopers are 4 year life span. would say that is pretty normal life span for coolant...
2005 Silverado 2500hd Duramax (Efi Live, 450hp
1972 Toyota FJ40 4" lift, FJ60 axles, FJ60 4speed with split case, 35's, Detroit locker rear, Lockright front, Marlin Highsteer, 105"WB, Saginaw with GM tilt column, soon to have: 30spline longfields, inners/outters, toybox.
1967 Porsche 912(100% stock)