Oil pressure intermittent

[Waterloo]

Oil pressure sensor, they do fail in time, and one of those sensors that when you replace, also change out the cam and crankshaft sensors. The crank and camshaft sensors are identical on the 871, I would imagine the 2250 is no different.

And you do know about the fuel pump? Rebuild prior to 400,000 miles?

If the oil pressure sensor is not the culprit, than we need to dig deeper. Is the mandate still on the motor? If it is, it could be carbon packing, soot monster clogging oil filter. EGR Tuneup in order, install secondary oil filter. Have you popped the top of the motor to inspect the cam lobes lately, and run the overhead? May be a good time to do that if not done in the past year.

If the mandate is no longer on the motor, who did the programming?

Just off the top of my head, others will chime in.