gauges can vary also

i have one thats 10lbs off from any others i have used.

my 440 does about the same thing and its well used with 75,000 miles on it.

may bump up to a thicker oil when you change it.

i run the napa fleet 15/40 in all of mine,10/30 drops pressure way down on mine

you did break the cam in with a oil additive with high zink correct?

on a fresh engine I change the oil 2-3 times in short order and cut the filter open to look for junk/shavings..ect

after that i lets it rip and change it when it gets black