The car has a high volume oil pump in it and I've been running valvoline 30 weight oil since I got it.. When I first start the car it is around 60psi at idle and of course as it warms up it drops. Once the car is fully warm it is only seeing about 10-12psi at idle which seems to low to me. Under throttle it always stays right about 40psi. Should I try switching to a slightly heavier oil like valvoline 40? It just scares me every time I look over and see the oil pressure gauge so low.