I went in for servicing on my Toyota Tundra this morning, and was the first
one in line.  After they finished servicing it, I asked if they were going
to give me a free lube job when I turned over 100,000 miles in the near
future.  They laughed but never answered the question.  Anyway, the service
manager said they got in their first Tundra with over 200,000 miles on it.
It was a V-8 2001 model.  He said the fan and water pump had to be replaced
because the radiator was completely clogged on the outside by dirt and
leaves and the engine was overheating causing the fan and water pump
failure.  The Tundra was being used in some type of farm business.
 He went on to say that he noticed the engine ran smoothly, but had little
power.  When they pulled the copper plugs, the electrodes were almost
completely gone.  The plugs had never been changed.  When they were
replaced, the engine still ran fine, but the power had returned.  He also
said the 8 cylinders had copper plugs but the 6s had platinum.
 He also said that they have several Tundras with over 100,000 miles on
them and none have had any problems.  So far, all I have done to mine is
service it.