In the end I went with Brad Penn 15W40.
Oil pressure hits 61 psig at 6k rpm. The
oil pressure is a site of beauty. Max cold
oil pressure 66 psig. I sent old pump to Mellon and their response was "its our fault we sent the wrong spring" I said what about the pumping inefficiency and they said it met spec, I said your spec is wrong. Never will I buy from Mellon again.......
I have a Miata with the power retractable roof, it is a mechanism of beauty. Love the car to death, cold AC, weather proof very loud on freeway at 80 mph regardless of top up or down. Big downside is zero power or torque!!! Great to run errands but not for just a drive vs cobra is great for a drive but not to run errands.