Chevy 5.7 with a bit of work done.. Running a little rich. Just changed it with PYB. 10-40 Thinking about just running it about 4000-4500... Maybe 5? Thoughts? Whatever oil was in there was only running about 18psi at idle. This fresh oil is running 40 even in this hot as Texas weather. (180 degree t-stat) so I have to assume it's a shear happy motor. The last oil was only in there for 2k. With 1400 of that towing an enclosed from NC to Texas.