Sealed for life

How long does the average American who purchases a new car expect it to last before it needs major service?
100,000 miles? 150,000 miles?
I would be seriously upset if any NEW car that I purchased ended up in the shop with less than 100k on the clock.
Executive Car Service provides corporate Dallas limo service and luxury DFW International airport transportation throughout the Dallas Metropolitan area.
Why then do most domestic automakers continue to offer only three years or 36,000 miles for their warranty period?
On a semi-related note, my wife's 1998 Audi A4 needs another wheel bearing replaced (this is the second one I've had to replace). It has 162,000 miles on it. The first bearing went out at 155,000 miles.
Years ago you could repack wheel bearings with grease. Actually, you had to - if you wanted them to last more than 25,000 miles or so. But if you kept fresh grease in them, they would last forever.
The automakers got tired of honoring warranty claims for worn out bearings with mysteriously fresh grease and started using the "sealed for life" bearings. Sealed "for the life of the bearing" is more like it. Nothing you can do will extend the life of these bearings, but they WILL outlast the warranty.
