This article is from the Toyota Tundra FAQ, by Steve Yee with numerous contributions by others.
There is a possible problem with the dipstick in the 2000 model year Tundra
being too short to reach the oil levels properly. The stock oil capacity is
6.5 quarts. If you fill to that level, your dipstick may not show the proper
level.
The fix for this is to order a 2001 model year Oil Dipstick. Part number is
15301-50101. Cost is roughly $15.
There are rumors that Toyota Engineering will issue a TSB for this issue. If a
TSB is issued, you may get this upgrade for free.
 
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