We must have a good quality of propane in my area because I have very few regulator problems. The Toyotas go over 10,000 hours without touching the fuel system. One has 32,500 hours and the regulator was done once. The VX Yales with Mazda engines and electronic type Cobra Impcos and a CA type mixer went 15,000 before regulator trouble, but the diaphrams in the mixers do fail after about 5000 hours. Two of the Yales have over 20,000 hours and very few problems, except for the first month they put in service, when new :-)