Auto Service

1.
Audi recommends using 75w 90 gear oil. You will need about 1.5 Liters. I bought 2 bottles of mobil gear oil at autozone for $9 each. Buy amsoil if you prefer that brand. I dont think it matters but you want to be on the safe side as these cars are highly specific to their needs.
2.
Jack up the car lifting all 4 wheels off the floor at a even level. This is required to accurately fill the fluid.
3.
Now lets locate the rear differential drain plug(circle) and the fill plug (arrow, blocked not visible)
4. Open the Fill plug first! You do not want to drain the gear oil and not be able to fill it back up.
5.
You will need a 10mm allen wrench for both plugs.
6.
Once you have the fill plug opened. Its safe to open the drain plug.
7.
Once its finished draining. Put the drain plug back in. And lets prepare to fill her up with new differential fluid. I used my pressure pump to push the fluid in. You can use any pump such as one from a shampoo bottle and attach a hose that will lead into the fill plug
8.
A shot of hose going into the fill plug. It is done filling up once oil begins flowing out.

1. Open the engine hood of the Audi A4 by pulling the hood-release lever located underneath the steering panel of the car on the driver side. Push the hood up all the way until it locks into place.
2. Locate the coolant tank on the driver-side of the vehicle, just in front of the wheel well. The tank is clear and has a blue screw top. Place a drain pan below the coolant tank underneath the car. This pan will catch the coolant that falls from the tank when its being removed.
3. Remove the three bolts surrounding the coolant tank with the 10 mm socket wrench.
4. Detach the three hoses that run from the radiator to the coolant tank with a clamp removal tool. Wait for the coolant to drain completely into the pan below.
5. Lift the tank out of the engine cavity. Replace it with the new tank. Reattach the hoses with the clamps and fasten the tank with the bolts. Remove the cap and pour in coolant until it reaches the MAX line. Close the hood.

1. Drive the vehicle onto the ramps and engage the emergency brake.
2. Slide the oil bucket beneath the vehicle at the oil plug location. BMW uses a skid plate with an easy access cover for the oil drain plug. Place the oil bucket beneath this access panel.
3. Open the access panel (in the center of the skid plate and labeled). Remove the oil plug using the 17 mm wrench. Allow the oil to drain until you have only a few drops dripping out. Replace the oil plug and tighten to between 20 and 25 foot-pounds of torque using a torque wrench. Leave the access panel open.
4. Remove oil filter housing cap using a filter strap wrench or by hand. You can use an adjustable wrench if desired. The cap is located center-front of the engine compartment, directly in front of the fan, accessed from above the engine. Pull the cap and filter out. The filter removes with the cap.
5. Replace the filter by sliding the old one off of the tube attached to the cap and sliding the new one onto the tube. Inspect the rubber grommets at the base of the tube and above the threads on the cap. Replace with the rubber grommets included with the new filter if you notice signs of looseness or damage. Reinstall the cap by hand and tighten one-quarter further with a strap or adjustable wrench.
6. Remove the oil fill cap. Pour 6.9 quarts of synthetic 5W-30 motor oil into the oil fill tube (labeled on top of the engine). Replace the oil fill cap and start the vehicle. Allow the motor to run for 2 minutes. Monitor the access panel beneath the vehicle and the oil filter cap for signs of leaks. Leaks would imply a damaged gasket or improper tightening. Correct the error and retest.
7. Close the access panel for the oil drain plug. Check the oil level with the engine oil dipstick. Fill as necessary.