By avoiding costly repairs due to neglect and lowering you gas cost due to driving a more gas efficient bmw 330 by doing some simple yet sometimes neglected maintenance to your bmw 330. 1. Keep your bmw 330 tuned. 25,000 miles for vehicles made in the 80's. 30,000 to 100,000 miles for vehicles made in the 90's. 2. Change your oil every 3,000-5,000 miles.
Some cars have transparent reservoirs with level markings.
Inspect belts and hoses monthly. Replace worn, glazed or frayed belts. Vehicles with spring loaded belt tensioners require no adjustment. Replace bulging, rotten, or brittle hoses and tighten clamps. If a hose looks bad, or feels too soft or too hard, it should be replaced.