My engine is coming back from the machine shop with new valves, valve springs, seat, and seals, new freeze plugs, and has been milled .010" total. My question is, which oil should I use?? I know that the factory spec is 5w-30, preferably synthetic. But which synthetic? Mobil 1? Royal Purple HPS? Amsoil?? So many options. What I'm wanting out of it is if I were to lose oil pressure again, that any residual oil left on the bearings would be slick enough and hold up long enough for me to either realize it, or for the oil to get picked back up by the pump and cycling again. I asked on Face-crack, and the result is highly mixed, including a few I've never heard of. It will be running slightly larger injectors, and a re-calibration, but other than that and the required milling, it will be stock.