The RV-12 maintenance manual refers you to the Rotax maintenance manual. The Rotax line maintenance manual says only that it must be replaced when overhauling the engine, or when the manufacturer says to replace it. They don't say whether they are referring to the coolant manufacturer, or the airplane manufacturer. So... apparently, check with the coolant manufacturer.
I figure the cooling system has to be completely drained to replace the hoses every five years, so that's when it gets new coolant. I think the jug of Dex-Cool I bought also says 5 years/150K miles.
Edit: Of course this assumes Dex-Cool coolant, there are other types. I know nothing about them. Check your coolant for more information about its service life, I guess.
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
-=VAF=- 2017 dues paid
Last edited by DaleB : 09-19-2016 at 12:09 PM.