What will cause a truck to lose all oil pressure and the engine to shut off while driving down the road?

Well, yes and no.
If the red oil pressure light comes on, yes the engine could stop running. You could actually lose oil pressure, or the switch could fail.
A "change oil" notice would not cause the engine to stop.

2001 Ford Focus Engine Stalls/Shuts Off While Driving: 18 ...

www.carcomplaints.com/.../Focus/.../engine_stalls_shuts_off_while_drivi...

I'd be driving down the interstate and my car would start sputtering like it was out of ... Mountain Hugh Howel Rd. Hill in my 2001 Focus and the car just cut off.

2005 Ford Escape Engine Shutdown While Driving: 24 ...

www.carcomplaints.com/.../2005/.../engine_shutdown_while_driving.sht...

The 2005 Ford Escape has 24 complaints for engine shutdown while driving. Average repair ... This problem caused my car to quit while driving down the road, it could have ended in and accident. ... I was 80 miles from home when the engine shut off. ... Was going to take it to the mechanic on Monday and the car just died.

Engine revs and loses power when driving. - CarGurus

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CarGurus

Your oil is under pressure as it is circulated through the engine, and at low RPM there is less pressure pumping the oil around. With the broken dipstick, I presume there is an oil-pressure leak and at normal operating speed there is enough capacity to maintain proper pressure, but the leak is more than the engine can overcome at low speed. I would suggest replacing the broken dipstick.

Knocking in engine and low oil pressure usually means bad main bearings. May have been caused by bad oil pump or just worn out bearings due to high mileage. If this is problem needs engine or rebuild old engine.

Prognosis is really bad, hate to tell you. Ticking comes from the valve lifters, losing lubrication due to lack of pressure and running dry. At redlights, when revs are at idle, oil pressure drops a lot, and engine really suffers. Have the vehicle taken immediately to a shop for proper diagnose and to see if engine can still be saved. The loss of power comes from the valves not actuating properly. Hydraulic lifters need oil at a decent pressure to "charge" , and if not charged, they will stay compressed, ruining valve lifting operation.

Does the oil light come on BEFORE the engine shuts down? I have to ask because it is NORMAL for the oil light to be on when the engine is not running. I had a customer that said the same thing just last week. After we wasted a bunch of time (which the customer ended-up paying for) checking the oil level, the oil pressure, and verifying correct oil pressure gauge, light, and sending unit operation, it turned out that the crankshaft position sensor was bad and causing the engine to shut down and it had absolutely NOTHING to do with the oil light - it was functioning as designed.

If the oil light is coming on before the engine shuts down, the first thing you need to do is check your oil level. If the oil level is OK, you need to check the oil pressure with a gauge to determine if there is an actual engine oil pressure problem or if the oil pressure sending unit, gauge or light is malfunctioning. Also, it is highly advisable to not drive the vehicle AT ALL if the oil pressure light is coming on while driving until the cause of the light coming on has been determined and repairs have been made. Otherwise, SEVERE ENGINE DAMAGE may result.

Sounds like a cooling issue. When the engine overheats it will get so hot that the metals expand making the motor sieze. When the engine gets that hot it thins out the oil making it less dense. This will make the oil thin thus reducing pressure.
When the motor restarts after cooling you will find the oil pressure returning to 40psi
The slow cranking issue is due to the engine being hot/siezed. Theadgasket damange, valve/piston dehere are other reasons for this condition to exist, but with the engine reaching 260 degrees, I would contribute it to the overheating problem.
Quite often when a engine overheats to this extent, it can cause other serious problems; ie, head gasket damage, valve/pistion deformation crack raidator and so forth , good luck

You mean the light shuts out the truck dosn;t stall right Yes then i would try replaceing the sending unit likely is the cause of the problem

Try replacing the oil sending unit, Some years had a fuel pump shut of built in to the switch so if the oil pressure went down it would kill fuel pump to stop engine damage. Yours may be faulty

MY 2002 RAINIER DOES THE SAME THING I HAVE BEEN TOLD IT IS THE THROTTLE BODY. I NEED TO CLEAN IT OR REPLACE IT. I HAVE THE 4.2 AND YOU CAN GET ONE FOR $200 PLUS SHIPPING. THE THROTTLE BODY STARVES THE CAR FOR AIR CAUSING THE IDLE, AND SHUT DOWN PROBLEMS. I AM GOING TO TRY IT THIS WEEKEND.