first wasnt anything wrong with 20w50Oil pressure gauge tubing and pressure?
I understand your worry being a new motor and you want every thing right you are running a lower viscosity of oil and you will have a lower pressure and yes the 20/50 had air bubbles in it as the 10/30. If it will put your mind at ease go back to 20/50 and see the exact same thing bubbles and a little higher pressure. It is fine enjoy the new motor and change the oil every 3500 miles.Oil pressure gauge tubing and pressure?
Thinner oils flows easier, but dont show s much pressure on a gauge. That is common and norm.
20W50 will always read higher than say 10W30.
Now really 20W50 shouldnt have been used on a new rebuilt engine. Thats way too thick for a new, tight engine. 10W40 should be the thickest you run
Airin the oil is norm. It's called windage and crankcase pressure. As the crank, rods, etc moves in the crankcase the oil gets whipped around and causes air bubbles, foam at times, and plus the new rings takes time to seat and seal so you probbly have compression slipping past rings and entering the crankcase.. Norm takes 1500-2000 miles to fully seat rings
Oil pressure, you need a min. of 10 psi per 1,000 RPM engine speed with engine at running temp.. Higher is much better than lower..
But you are fine with as low as say about 8-12 psi at a hot idle (15, 20, 30 psi is even better though)