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how do the plugs look when pull them?
are you fouling plugs?
how do you drive the car?
if fouling then run a hotter plug.
if racing run a colder plug.
if city driving or idling a lot run a hotter plug.
a "hot" plug is really only needed for idling and startup. if a car was only driven at hiway speeds you could run a very cold plug.
look at it this way, the temperature range of the plug is what keeps it clean. it has to stay clean to keep from fouling. if you are not fouling them then you are probably OK but this can also depend on my other questions and how they look.
hopfully this will help YOU decide on what you need
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86 930 94kmiles [_ _] RUNNING: [__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ SOLD
03 BMW 330CI 220K:: [__] RUNNING: [__] NOT RUNNING:
01 suburban 330K:: [__] RUNNING: [__] NOT RUNNING:
RACE CAR:: sold
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