Everything holds up better in the arid southwest ... mechanically, but not cosmetically. The UV will beat the tar out of paint and vinyl and rubber, but the southwest is very easy on drive-train systems, gas or diesel.
The act of preventative maintenance, in and of itself, is FAR MORE important than brand/grade/base choices among lubes and filters.
- under maintaining something is akin to abuse/neglect; that can kill equipment by shortening the lifespan
- over maintaining something has never been proven to be anything but a waste of time and money