Dot-5 ok?

My entire brake system was new so it seemed like the time to try DOT5... it's not hard on paint if you have a spill, and supposed to be more resistant to taking on moisture and rust. It's been used on cycles and aircraft for years so my friend and I thought we'd try it. I've heard of other guys using it and I've been happy, just don't want any surprise failures at some point so thought I'd ask.

a fellow I bought a dodge truck from put DOT 5 in and meantioned it when I purchased it, what surpised me is that he also told me that the brake lines were the original and he drained the DOT 3 when he bought it new and put the DOT 5 in. I could tell he wasn't lying as the lines still had the wire wraped around it on the master cylinder lines and others seems DOT 5 doesn't rot the lines as bad