No the engine will not interchange.
It is inside the HVAC housing, behind the glove box.
Yes.
In the gas tank
Yes, it is built on the starter.
remove glove box
5w30 or 10w30
10w3010w30
32 oz
Front of the engine, behind the engine mount.
Unlock the doors with the key.
Not that hard.
If the speedometer works but the odometer does not, the odometer has failed.