I just dropped off my original radiator at an old school radiator shop for a flush and inlet fix. They have decades of experience so I am thinking I should open my ears when they have advice to share. When I asked for his advice on a radiator cap he mentioned that unless I am running in the mountains (higher elevation) it may be beneficial to run a lower psi cap, something like 5 psi. He said it would help take some stress off the cooling system in general. That is what he does personally on his older vehicles. He mentioned it is easy enough to carry a 16psi cap along and switch it out if ever needed. This made sense to me. Anyone running with a lower psi cap like this. If so, which one? Btw, my local elevation runs in the 800-900 foot range for the most part. My upcoming trip to Sturgis, SD I'll be in the 3000-5500 foot range. So maybe run a lower cap locally and switch out to the standard (16psi?) when I'm cruising around the Sturgis area?