10. Crush washers for the drain plug (I got these from the dealership. Audi of Stevens Creek was nice enough to just give me a couple!)
1. Pop the hood open first. Then, jack the car up, or drive it up the ramp. Make sure the car is secure and you've use the correct mount points for the jacks. After this, make sure you unscrew and open the engine oil cap and remove the dipstick (if you've installed one like me. If not, just remove the oil cap)
2. Next, we need to remove the under-body panel that covers the front end. The panel is held together by 11 phillips screws; two right up front, 3 on the other end and 3 on each side (near the front wheels). The 3 at the rear of the panel remain attached to the panel and will NOT drop off even after unscrewing them
Once you've located the drain plug, place the oil catch container and plenty of paper towels or rags underneath the drain plug. This CAN get VERY messy if you've not done this before and are not prepared for it.
Remember to quickly unscrew the drain bolt to avoid getting oil all over your arms! Once this is done, watch your S4 let loose the juice! Given that there's close to 7 quarts in there, it will take some time to drain completely. Take a break. Grab some stout and pat yourself on the back...the hard part's done!
You need to wait until the time interval between consecutive drops is great than 5 secs...again, this will take some time. Once 99.99% of the oil has been drained, take a couple of paper towels and clean the area around the drain plug thoroughly
8. Use the 36mm socket wrench to unscrew the oil filter housing cap. NOTE: I had a tough time getting hold of a 36mm socket. The PepBoys, Harbor Freight and AutoZone near me did not have this! Luckily, the Sears about 3 miles away did, although only for a 1/2 inch drive wrench (I had a 3/8 incher). So I went ahead an bought a 1/2" drive wrench along with the socket