The first RECOMMENDED oil change is at 5k, and each 5k after that. However, many people like to make their first oil change at 1K right after the engine has been broken in, to make sure any metal filings are removed from the engine immediately. There is nothing wrong with changing your oil more frequently, like every 3k, some people here will say you are wasting your money while others will tell that your engine will last longer since you keep "fresher" oil in it all the time. YMMV.

CAMRHEE Hybrid
Completed Mods: RK-Sport body kit, 18" LexusGS430 wheels 235/50ZR18 tires, TRD/SE springs, Rear Lip Spoiler, Terk XM-Direct, Smoked tail lights, Sliding Armrest, Rear Bumper Applique, Front License Bracket, Lower Grill chrome inserts, K&N, Blaupunkt THB200A sub, moved rear HSD emblem
Future Mods: fog lights, black chrome my wheels

http://www.greenhybrid.com/share/fil...fterFront4.JPG