What is normal for the oil guage to respond from zero pressure to about 40 psi when the engine is cold? By cold I mean summer temperatures when you first start it up in the morning. Does your guage just jump from zero to mid range or is it a slow response time? Mine takes about 3 seconds from zero to 40 when cold. When hot only about a second. My guage runs at the 40 psi from then on cold or hot, high speed or idle and doesn't fluctuate very much.
I'm running valvoline 10-30w.