My first oil change on my new Fiat 500 Sport was a two hour affair. In order to cut out the guesswork for other doityourselfers, here is a rundown of the procedure.
1. Remove plastic engine shroud. Just pull up on it and it will pop off at 4 attachment points on the top of the engine.
2. Remove the black airbox which is directly on top of the engine under the shroud. There are 3 silver 8mm bolts ( 2 at the sides and one in the back ) which attach the box directly to the engine. Loosen these until you can move the airbox assembly freely. There are 3 hoses which need to be detached from the airbox. One at the front on the right side which is accordianed and oval in shape, one which is on the top on the right and about 3/4" in diameter, and one which is on the right toward the back which is about 2" diameter and has an 8mm hose clamp on it. Detach all three at the airbox and lift the airbox up and place to the right side of the engine compartment. There will still be 2 flexible hoses attached at the rear of the airbox, but they will allow you to move the airbox freely to the right. This will give you room to access the oil filter canister which is located just behind the radiator on the left side.
3. Jack up the car on the left side front to give you room to crawl under the vehicle for removal of the plastic belly pan.
4. Remove the plastic belly pan under the engine by removing the 6 silver bolts. There are two at the front, two at the sides, and two at the back. Pull the pan back to unclip it from the lip on the leading edge, and it will fall right down so you can get it out of your way.
5. You will now see the oil pan and 13mm drain plug which is rear facing and directly above the metal strut which braces the frame from side to side. Remove the drain plug and drain the oil.
6. Locate the oil filter canister which is directly behind the radiator on the left side of the engine compartment. It is surrounded by a molded shield on its upper right. You access it from the top, and not underneath the car. It is a black domed plastic piece with a 27mm hex extension in the center. Use a 27mm socket with a 6" ratchet handle and loosen the cap of the canister. This is tricky since there is very little room and a hose in the way. The cap may be tight from the factory, but just keep turning to the left and unthread it all the way until it can be removed. The filter element snaps in to the cap, so it will not fall out while removing the cap. Remove the filter element by pulling firmly on it until it snaps out. Install the new one so it snaps in to the cap. Replace the rubber O ring on the outer edge of the cap and lube with oil. Install the cap and new filter and thread it down until you feel the threads end. Do not over tighten since it is a plastic part.
7. Install the 13mm drain plug in the oil pan.
8. Install the plastic belly pan with 6 bolts and lower the car from the jack.
9. Install airbox by reattaching hoses and carefully threading in the three 8mm silver bolts.
10. Add 4.0 quarts of 5-30 oil. Start car to circulate new oil. Check dip stick for oil level.
11. Snap on plastic engine shroud.
Hopefully this will decrease the time to perform the oil change to about 45 minutes for those of you who want to do it yourself, or believe that oil should be replaced more often than the factory recommended 8,000 mile intervals.