Quote:
Originally Posted by BYprodriver
In 2002 Boxsters went from single hole injectors to 4 hole, O2 sensors changed to the improved Bosch LSF, also non-return fuel supply. All this led to more accurate air/fuel ratio which makes plugs last longer. I was refering to how the air-cooled engines are a completely different design from the M96 engines requiring different service procedures.
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The injector improvements you mention likely lead to better distribution through improved atomization of the fuel in the combustion chamber. Regarding spark plug life, the effects of these improvements are probably so small as to likely be irrelevant. The correct heat range and electrode material have a much larger effect on plug life.