Just for the record, multi-viscosity oils (like 15w-50) do not get thicker as they heat up. A 15w-50
oil has the viscosity of a 15 weight at cold temps and the viscosity of a 50 weight
oil at hot temps. They thin down, but not as much as straight weight oils. The synthetics are better at this trick than are the paraffin oils.
My own opinion on the
oil pressure is that much of the pressure of thick oils is lost going through the long lengths of tubing, the filter and the oil cooler on Cobras. When I switched from Castrol 20w-50 to Mobil1 5w-30 my pressure went up! Remember the pressure sensor is at the end of all of that plumbing I just mentioned.
Bob