Oil:

The old adage about changing your oil every 3,000 miles may no longer apply.  Under normal driving conditions, the oil-change schedule can be extended to 7,500 miles.  The trick to determining the best oil-change schedule for your vehicle is understanding what kind of driving you do. Severe conditions may require you to change oil more frequently. Check your owner's manual for the manufacturer's definition of different types of driving conditions and the recommended schedule and type of oil for each condition.
Source: http://www.tomkennedyautorepair.com/tips.htm