I've had the original G12 "lifetime" coolant in my Porsche for 5 years. It's described as Nitrite, amine, phosphate, silicate, borate free (OAT). It holds over 7.5 gallons of coolant. The cheapest I can get G12 off ebay for $35/gallon, so a drain/refill will cost $135. If I ever have to drain it for repairs I'd rather not have to pay $100 to refill it. I'd like to convert it to Dexcool or G05 I think. If I convert to Dexcool or G05 do I need to totally flush the system? This car has a long complicated cooling system with 3 front radiators. My tap water is from a well with lots of calcium.
What about running a coolant analysis and only replacing it if indicated by the analysis?
What about running a coolant analysis and only replacing it if indicated by the analysis?