oil pressure problem?!?!

Can anyone find the the idle pressure and cruising pressure for my oil. It runs lower than it did after i got an oil change.

Im thinkin that they put in 5W30 (idiots) and would that make less resistance for less pressure needed.

Thanks for any help...

Brandon

how much pressure do you have?
I always use 5w30 in the winter, once your up to operating temp the pressure should be the same as 10w30....