I don't think platinum plugs improve performance or economy but they
definitely last longer. Also, while normal plugs can last 50k miles, after
10 or 15k, the gaps begin to increase because the electrode wears down and
this can affect performance or economy. This is why people talk about
pulling their plugs and re-gapping them.

Platinum plug electrodes do not wear like normal plugs and you don't have
that problem. I routinely, keep platinum plug in my truck for 100k or
longer.


"Vito" wrote in message
...
"Frank Taylor, Jr." wrote:

In my case, the reason I would like to use platinum plugs is because
they
last a lot longer and do not have to be re-gapped like normal plugs do.


I'm surprised that's true. The standard plugs in my cars and street
bikes last 50,000 miles - forever AFAIK. We used platinum plugs in very
high output engines (150-200 HP/Liter) because ND and NGK gave them away
by the handful so they could advertise that winners used their plugs,
but I never saw any numerical evidence they improved performance or
lasted longer - not saying they don't just that I never saw it demo'd.
Naturally YMMV.