100,000 miles Oil light came on and engine stoped, is it worth rebuilding engine

Inside the oil pan. Not an easy job. Just a note... Probably not the pump. Probably is the main and rod bearings on the crankshaft. Pull the engine. If really high miles rebuild the engine or replace it. If low miles (like 100,000), replace the crank and bearings. Unless a bearing has spun. You would know because there would be a constant knocking in the engine lower end.

You can't trust the light sensor, so you need to get a mechanical gauge. A cheap capillary tube one is only $10.
You should also change oil.
If the engine has over 100,000 miles, you could consider 20W-50 oil.
You could also have a problem with fuel or ignition, causing oil dillution.
Does it look too thin or smell like gas?
It could also be the oil pump is bad, but that is not normally worth trying.
The number of miles on the engine would help.
But low idle oil pressure is not that important.

3000 to 5000 miles

Here is the basic maintenance list for your Jeep:

~ Inspect lights and check tire pressure at least monthly or before & after each trail ride

~ Oil & filter change, chassis lubrication, differential and transfer-case fluids every 3,000 to 5,000 miles or 3 to 4 months - if you have recently crossed through water deep enough to submerge the centre of your hubs, replace the differential fluids as a precaution

~ Underhood belt and hose inspection every 3,000 to 5,000 miles or 3 to 4 months (every oil change)

~ Tire rotation and wheel balancing every 6,000 miles or every other oil change - driving offroad can knock wheel weights off a wheel, so you may need to have this done more frequently

~ Brake inspection every 6,000 miles or every other oil change - if you have rum brakes in the rear, ensure they are cleaned after each trail ride where you encountered deep mud/snow

~ Replace air filter every 12,000 to 24,000 miles or as indicated by inspection - dusty trails can shorten these intervals dramatically

~ Replace fuel filter every 24,000 to 100,000 miles

~ Automatic transmission service every 24,000 to 100,000 miles

~ Wheel alignment check every 12,000 to 24,000 miles or as indicated by tire wear - offroad driving can knock wheels out of alignment, so budget for an alignment every 3 months, then watch tread wear to see if it's needed

~ Cooling system flush and refill every 40,000 to 100,000 miles

~ Belt and hose replacement every 60,000 to 100,000 miles or 5 to 8 years

~ Engine timing belt replacement every 60,000 to 100,000 miles (when equipped) or 5 to 8 years

~ Air conditioning performance check annually, usually in the spring - be sure to run your A/C during the winter for brief period to ensure all hoses and valves stay lubricated and operable

1 quart every 2000 miles. Not all cars are created equal. The same model may burn alot less or even more.

Standard Answer for Timing Belts/Chains: 100,000 to 120,000 miles is when the Timing Belts/Chains start malfunctioning or failing. Some people want to go ahead and change them before malfunctions/failures happen.
I just replaced mine on 2002 Dodge Grand Caravan which just turned 100K. Most Timing Belt/Chain failures will cause more costly engine damage when these fail, including a need to replace/rebuild an entire engine.

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

not likely

This is Toyota's scheduled maintenance for the RAV4 at 100,000 miles...

Replace engine oil and oil filter 1
Rotate tires
Replace engine coolant 2
Visually inspect brake linings/drums and brake pads/discs
Applicable Footnotes:
1) Reset the oil replacement reminder (“MAINT REQD”) light after replacing engine oil, if vehicle is equipped with this light.
2) Initial replacement at 100,000 miles/120 months. Replace every 50,000 miles/60 months thereafter. Refer to "Engine Coolant" in the "Explanation of Maintenance Items" section in the back of this guide for more information.

Service your cooling system every 5 years or 150,000 miles. The GM Dex Cool has a life of 5 years or 150,000 miles which ever comes first. Replace the thermostat also and buy the fail safe thermostat, it cost a bit more but worth it.

Service the engine (spark plugs and wire) every 100,000 miles or till engine management prompt attention. (service engine light DTC code)

Service the transmission every 3 years or 60,000 miles, replace the transmission oil and filter. Transfer case fluid and differential fluid.

Service the engine oil and filter every 6 months or 3,000 miles. Lube Chassis

Service the air filter and cabin air filter, wiper blades every 15,000 miles or once a year.

If depends on the milage of the car, some lights come on after 100,000 miles just to remind you that maintanace is require but is good idea to run the car thru a scanner to be sure.