3406e Oil Pressure Dropping

The ones I have seen with enough fuel in the oil are growing oil but that is a good point if it is already using oil.

 

Oil filter brands, who makes Cat filters, are they the same, what media is in them is a whole different subject. Search block, top right.
I am just sharing experience and saying filters are cheep. Throw one on it. Take an oil sample.
Will not go wrong with Cat filters but I was not looking to repeat what has already been said.
I would run the engine enough the oil is all mixed up but not hot. Ease the plug loose and let a little drain out slow. Then fill your sample bottle the same slow way. Top the oil off and see what comes back on your sample.

 

so you've got 17,000 some odd miles on this oil change correct? first thing I would do is change oil and filter and see what happens. what is your normal service interval?

 

I was lazy and did not do the math but you are right. I would still do the oil sample.

 

Pull the sensor and check for debris, had a 3126 cat long block, fresh install and 0 oil pressure. After many hours of troubleshooting I found debris in the fitting for the oil pressure gauge. Just a simple check.

 

I thank both are fine. Company used to use Mobile but kits came through oil supplier.