In a market often ruled by fad and fashion, it is worth noting that Buick has called its basic full-size car "LeSabre" for 43 continuous years. For the past 10 of those years, Buick likes to remind us, LeSabre has out-sold every other full-size car. Of course the definition of "full-size" has changed a bit since 1959, when a unit-body car with V6 power and a 112-inch wheelbase would have been considered at best a "senior compact." Nostalgia aside, however, the current LeSabre provides all the room, comfort, and practicality demanded of a full-size car today, with modern fuel efficiency and advanced safety features that have earned it a double five-star rating in U.S. government crash tests. Buick LeSabre was totally redesigned for 2000, and now moves into 2001 with new dual-stage airbags, 15-inch aluminum wheels for LeSabre Limited, and an oil-change interval that's been stretched from 7,500 to a full 10,000 miles. OnStar, GM's 24-hour on-demand navigation and driver-assistance service, is now factory installed on all LeSabre Limiteds and is optional on LeSabre Custom.