This kind of piggybacks on what others have already said, but I think it is useful info. There are two types of extended warranties, inclusive and exclusive. An inclusive warranty will spell out everything that is covered under the warranty. In the contract it will say:
Covers:
Engine - Block and cyl heads and all internally lubricated parts including pistons, piston rings and pins, crankshaft, mainbearings, rods and rod bearings, etc
It will go through and list every single part that is covered. If the item that breaks is not specifically listed in your contract you are SOL. An exclusive warranty is much better (although few companies offer them). A exclusive will basically say:
Covers:
Engine - Everything except oil filter, fan belt, etc. It will basically list all of your normal maintenance items. This will CYA much better than the first warranty.
The other thing I am going to stress is DON'T PAY RETAIL. I work for a company that sells extended warranties, and there is HUGE markup in all of them. The dealers cost is 55% of MSRP (which is almost always what they quote you).
If you answer these questions I can let you know about how much a warranty like that should run (if you buy one).
Model: 2500 or 3500
Current Mileage:
State:
I highly doubt retail will even be over $2000, and dealer cost shouldn't be more than $1100. If they won't budge look around. Somebody will sell you one for less.