AndySilverado

Posting an update on this topic... Sorry it has been so long because my pickup made it 4700 miles (and 150 engine hours) which is about 3000 miles farther than I thought it would without the oil pressure going below 20 psi. Just like before, it got closest to low pressure after it was warmed up and at idle. The only major difference between oil changes that I can think of was the climate: 3 coldest months (December to February) vs mildest months (March to June). I did full synthetic (https://www.mobil.com/en/lubricants/for-personal-vehicles/our-products/products/mobil-1-5w-30) and brought my own AC Delco UPF63R so we'll see how this goes. Thanks again for all the comments!

My pickup has 145k miles. Thanks everyone for your replies. I’ll do good filter next time AnA hope it resolved this issue. I’ll probably post again in about 2000 miles.

I have a shop do it because it’s so convenient. This last time was LOF. They installed a Parts Master 67060. https://www.amazon.com/Parts-Master-67060-Oil-Filter/dp/B0094IO7P8

For how many miles/hours after your oil change with that filter does the problem go away? My 2010 Silverado 1500 does the same thing. An oil change every ~2,000 miles fixes my low pressure. If I try going longer, the low pressure returns. I just did my third “short interval” oil change because of that issue and what fixes it.