I always oil the underside of my cars, especially the older ones. And crack, crevice, seam, or hole, put a little used oil, or NAPA chain and cable lube right in those spots! The chain and Cable lube works great, it spreads and keeps moisture out. I have been using it for a long time on my Brat and it has saved it a lot longer than it would have lasted!! But make sure it is very clean and dry before doing this. So it's best in the summer