As 2003 Jeep Liberty uses 5W30 engine oil. It can be synthetic, conventional, or a blend.
5w30
Yes, you can.
5W305W30
5w30
Remove transmission oil pan
In the cap on the front pass side of the engine.
Most likely.
Open the hood. Filter is on the lower right front
5.5 quarts
It is on the passenger side rear of the transmission case.
You have to remove the transmission oil pan to access the filter.