Family member gifted me a 2007 F-150, 2WD XL, V6 121k odo. I’m now the 2nd owner. Absolutely no rust (from the south) and in overall good shape, just sat in the yard for 4 years. Passed inspection. Cleaned it up and threw on new tires, been driving it nearly daily for a month now. Only main issue is it has a rear main seal leak. Is it worth taking to a shop for repair or just keep driving/keeping an eye on for as long as possible? Also how long should this vehicle realistically last, I’ve never owned a Ford but my mother had a 2004 F150 (biggest money pit ever, she had it for a couple years before finally getting rid of that pos.)