Going to change out the Coolant (3.0 VM Diesel) with Nulon Red as Drover and others recommend, Got 6 liters from Supercheap when they had it on special 25 % off, open to any suggestions to try and get it air lock free first up. Just one question can the Thermostat be separated from the housing and purchase a thermostat independently if needed. Have looked through Gates and Tridon catalogues but stuffed if I can find one, just want to be prepared if I feel it needs changing out, preventative maintenance, sorry if its been asked before