496 Mag Oil Pressure question. I have a 2009 350/370DA with twin 496s at about 650 hours each. They run fine and have new oil changed this past spring using Mercruiser synthetic and are both full. At idle, the There is an oil pressure difference of about 0.2 psi, however at slow cruise (8-10 mph) that difference increases to about 1psi, with one engine putting out about 5psi and the other around 4psi. On a relative sense, this is a substantial difference, but on an absolute sense, not sure if 1psi at cruise matters. There are no alarms or anything going off. Recently had a mechanic replace water pump and one of the pulleys on the engine with lower oil pressure, not sure if belt tension may have a role in this situation or not. I welcome thoughts or feedback. If it's not an issue, I won't worry, but oil and temp are those types of things that gets me on edge. Thank you.
