How to Tune a BMW Series 5

Performance Air Intake
1. Unhook the air filter casing from the engine, located on the driver side of the vehicle. A performance intake upgrade will free up horsepower and improve fuel efficiency, and the new air filter can be removed and cleaned periodically for reuse.
2. Lift the old filter out of the casing slowly, making sure dirt and debris does not spill onto the engine bay.
3. Remove any dirt or debris that fell into the intake system carefully.
4. Install the new, aftermarket air filter just as the old one was positioned. Fasten the hardware back into place as necessary.
5. Leave air filter casing off of vehicle to expose filter to more air, ultimately leading to maximum power gain. Regularly monitor the air filter and clean annually.
Oil and Oil Filter
6. Jack each front wheel off of the ground to gain access to the oil pan and filter. Once each side has been lifted, place a jack stand behind the wheel and lower the vehicle down until it rests firmly on the stand. Change engine oil once every 3,000 miles to optimize engine performance.
7. Put the oil recyling container under the oil pan and remove the plug. Let all of the oil drain from the pan and replace the plug when finished.
8. Turn the oil filter counter-clockwise with an adjustable wrench to remove.
9. Add motor oil to the new filter until it is 2/3 full. Use your hand and turn the filter clockwise into position until completely tight.
10. Pour new motor oil into the engine's oil compartment with the provided funnel. Check the dipstick to measure the levels of the oil, simply adding more if needed.
Distributor Cap and Rotor
11. Remove the black cap that protects the distributor of the BMW 5-Series. Both of these are located at the front of the engine, and not hard to locate. Unbolt the distributor from its location and set aside.
12. Unscrew the bolts holding the rotor in place. Pull off this shield and inspect the O-ring inside. Replace if necessary.
13. Tug on the spark plug wires from the boot with the provided wire pullers. Connect each wire lead to the corresponding position on the new distributor. Position new distributor into place and put dust shield back on top.
14. Bolt new rotor into place using the old hardware. Fasten the distributor cap back into place using the provided hardware.
15. Jack each side of the vehicle off of the jack stands and lower the car.