Join Date: Oct 2004
Location: New Braunfels, TX
I've be driving since 1967 and have owned too many cars and motorcycles to count. Two or three years ago I calculated that I have driven close 1.25 million miles over my life time. Most of that in high mileage old vehicles. My Suburban, that I bought new in 1994, has about 265,000 and accounts for about 20% of my 1.25 million miles and still has the original thermostat.
In all those vehicles and all those miles I have had to replace 1 thermostat and that was in a 1964, drop top, 4 on the floor, alumimum block V-6 Buick Special with 120,000 miles on that I bought for $300 and drove the snot out of for 4 years and put on about 75,000. Even then I am not sure the thermostat needed replacing but the guy at the autoparts store told me I should since I was replacing the water pump so I did .
So guess the anwser is change the thermostat once every 1.25 million miles or every 44 years or if it breaks. But I don't see it as a preventative maintenance issue.
According to the official Honda Service Manual, under normal conditions your coolant should be changed every 2 years. More often if you live in either the Death Valley or International Falls, MN. The same recomendation is made for brake and clutch fluid. I do mine about every other year and it takes me about two hours. The biggest pain is pumping out the brake fluid and bleeding in the correct order.
2003 VTX 1800 C, Rinehart Exhaust, Hypercharger, PCIII, Custom map for each cylinder, 1300 FD, Spec 3 F-wheels, 200x50x18 Metzler