I run straight 30w in the summer and 10w 30 in the winter. Oil preasure stays the same about all year long that way. If I run 10w 30 in the summer it runs a little low at hot idle.
Thicker oil in the summer works. On the extreme end I ran straight 60wt when I had a severe rod knock. Anytime the rpms went over 2,000 with the oil cold it would blow the filter off. I oiled down my street several times. My parents really liked it. I can still follow the oil paths where the filter first blew off to where I flipped a U all the way back to the driveway.