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I think you are confusing me with someone else. No smashed pan on this thing. Underside of my M998 only shows some minor rust on the transmission oil pan, and a whole lot of dirty from off-roading in my pasture. :). But there are no dents in any of the pans, and the pan surfaces are...

local specialty car used-car dealership. They normally sell classics (pre 1980) cars. Their usual mode is repair the seats, service the vehicle, repair/replace mechanical components that need it, repaint if necessary, etc.. They bought the M998 from someone as a trade-in, were going to...

Ya, I've not checked the CDR at all. I'll add that to the list of things to check.

It's a diesel, it's noisy compared to any of the gasoline or rotary engines I have. ;) But it's way above the range in the service manual, and that makes me nervous. The fact that it's not high across the entire range (like I would expect if something was clogged/pressure relief was bad)...

I don't know. I've messaged the dealership I bought it from to ask. If I had to GUESS it would be 10W30 or 15W40. I know with winter coming soon, I need to move to 10W30.

Ok, I've got a manual gauge, and also was able to hook up the tack. So I've got some "real" numbers. 6.5L (2004) Cold idle - 600 RPMs - 35-40 PSI Warm idle 650-700 RPMs - 30-40 PSI 55 MPH - 2800 RPMS - 55-57 PSI 55+ MPH - 3000 RPMS (roughly) - 57-58 PSI The engine never exceeded 60 PSI...

I just replaced a non-functional dash gauge with the same one. I'm pretty sure the previous owner of the vehicle mismatched the sending unit and the gauge, so now I need to correct that.

I just looked at the pictures I took of the back of the engine (inside the cab), the oil pressure sender looks exactly like the 60 PSI units I see on ebay. Argh, I replaced the dead 0-120 PSI gauge with a new one, but the sending unit never matched.... so a previous owner must have put in the...

Hmm I will definitely need to check it’s the right sender, but I’m suspecting more and more the problem is the sender. I ordered the big Humvee service kit with all of the tools and gauges. Hopefully it has a pressure gauge that can be used or I’ll pick one up…

Brand new gauge, but existing sensing unit. I’ll get a mechanical gauge and test it properly. I’m assuming it’s fine, and probably the sender right now. Crossing my fingers!

I finally replaced the not-working oil pressure gauge with a new one. And I'm now getting a reading. Cold idle, between 30-60. Warm idle, 30 0-30 MPH - 30-60 50 MPH - 100-120 55-60 MPH - over 120 The numbers at 50 and above seem high to me, but I have no frame of reference for this engine...