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i was thinking about your problem today while enjoying a nice drive.
if the mixutre is lean, with the old dirty plugs it may run fine, but with the new ones, the lean condition could show itself.
i would still go with W5's. the W3 is more suited for very hi compression or race motor.
my brother's 930 uses W3 or W4's.
with W3's, the mixture would have to be very lean to prevent fouling
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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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