My '86 f150 with a 191,000 mile 302 has had oil leaks (intake manifold mostly) and low oil pressure due to being worn out since I bought it 30k miles ago. As long as I stay on top of adding oil it runs fine (100 miles a day for weeks at a time with no problems). It's been run low a few times (10k miles ago) and had a bit of a ticking at idle after a long drive to remind me to add oil. Fully oiled it makes no ticking and idles ok even after a long drive (though the gauge will show low pressure in a traffic jamb type idle). I've checked the pressure with a mechanical gauge and have verified that it has around 5psi at startup/idle but has no knocking at any time and the pressure is fine at speed. I'm planning a trip in a week from Washington, DC to california and back, considering I drive like a grandma at 60mph or so in the right lane and will be running 20/50w oil which it likes (sometimes I can't find it so it runs 10/30) is there any reason to think a bearing would suddenly spin or other catastrophic engine implosion awaits me?