Oil pressure drops after 2000 miles +/- after oil change solved

[ks03]

i went with the 51042XP for the first try, used valvoline synthetic blend 5W30 since I got the truck at 97,000. Approaching 195K now

Just to add a bit of uncertainty…
My old work van got 5k oil changes, sometimes at Ford, sometimes at a valvoline quick change. Noticed it would knock sometimes under high rpm and high load… then noticed it quit after an oil change… eventually figured out it only did it about 3k after a valvoline oil change, and never after changed at Ford.
Prior to that, I’d be as happy to run valvoline as any brand. But I figured it was one of 2 things, their oil sucks, or that shop was putting 5w30 in 5w20 engines, and didn’t show symptoms until it got dirty enough or deteriorated in some way

 

[OR VietVet]

What oil was the Ford dealer using? Motorcraft oil?

 

[ks03]

What oil was the Ford dealer using? Motorcraft oil?

No idea on brand. I figure there’s a chance valvoline wasn’t pumping 5w20, but highly unlikely to be an issue at ford