What is it off idle?
The viscosity of the oil will only effect the psi during warm up. Engine oil will only vary slightly with psi from cold start to reaching temperatures above 160.
With respect to the quality of the gauge and sender(if electric) it may be a good idea to have a shop check you actual psi to rule out a misreading gauge.
When I questioned the dealer I was told that 7 to 10 pounds was normal with the 5/30 synthetic at operating temp. Approaching 40K miles and no adverse effects yet.
That pretty much jives with what I've seen although at operating temp, and at idle it's more like 6-10 (psig) on my Marshall Instruments electric. My 2005 is at 48.5k miles.
Cars like humans do not do well with high oil pressure. We always think higher is better but this is not the case with cars. Volume is the benefit when talking about oil. Causes of concerned from constant very low oil pressure readings (that do notincrease with rpm) would be from an engine getting tired (high mileage or spirited daily driving?), faulty OP sensor or gauge, in the worst rare case an oil pump that has clearances beyond the specified tolerance with the oil pump gears and oil pump housing. If the oil or engine light is not coming on and you are not hearing strange engine noises rest easy! :lol:
Change your oil often and before the required intervals!!!!!!!!
