Why do spark plugs last so long on new cars?

["Bob Donahue" <bobmgtd@insightbb.com>]

The owner's manual on my '97 Oldsmobile says to change the spark plugs at
100,000 miles. Does anyone know why the modern plugs last so long? Can we get
100,000 mile plugs for our MGs?

Bob Donahue (Still Stuck in the '50s)
Email - bobmgtd@insightbb.com
Cars:       52 MGTD - #17639
               71 MGB - #GHN5UB254361
Member:  NEMGTR #11470
               NAMGBR # 7-3336
               Hoosier MGB Club
               Olde Octagons of Indiana

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