oil preasure issue , need help!!

Hey guys , thanks for all the response. The car does not smoke the engine sounds good when running. The engine is full of oil and I really have no idea how many miles on the engine . It only drops to 10 - 15 psi when at idle. But when I'm driving it its at like 45 . I thought it would be either the oil pump or the clearences . I'm running 10w30 synthetic oil someone said to switch to a higher weight , and it would be better. I would love to get a new engine in it , just really don't have that much money I'm 28 and cash is kinda tight and this car allready consumed most of my money haha.