Jimh, the OP only mentioned a diesel in his original post. Guessing that's why everyone "jumped on the diesel train."
I agree completely about used vehicles in the PNW. Having lived in a lot of different parts of the country, the PNW, wet side in particular, seems to be the overall easiest environmental conditions for vehicle longevity. Of course if everyone comes here to buy, it will make the already higher than avg prices go up even more!
Pluses here:
No extreme heat or cold. Easier on components.
Cloudy 300 @?!;&@ing days a year! Easy on paint, plastics, anything subject to UV damage.
No snow means very little salt or calcium on the roads, although king co likes to coat the roads with mag at the first sign of frost. Rains enough to wash it all away quickly though.
A lot of rain means fresh water rinse of under carriages daily from Oct - Apr. no build up trapping moisture for rust.
Wet roads over half the year are inherently easier on tires, drivetrain etc. Less stress on everything because in general, have to drive with a lighter foot on wet roads.
This really is worth considering for those buying used vehicles.