Well here's another coolant question for you all, maybe a stupid one but i haven't been able to find an answer. I've done lots of reading but I'm still unsure of what flush intervals people are doing (if any) when they switch to other coolants like CAT, fleet charge, or Fleetguard Compleat EG. EDIT: I guess I posted too soon. I'm assuming everyone who's running "lifetime coolants" have installed coolant filters to maintain the coolant, otherwise flushes would be required. So there's no point in switching over unless i put the filter in at the same time.