What spark plug do you use?
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Join Date: Oct 2009
Location: Perth Ontario Canada
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Iridiums are definitely the way to go. I use them in all my "modern" engines. I don't know about heat range options, but as far as manufacturers go, I put a set of Autolites in the XKR a couple of thousand miles ago (found them at less than $2 per plug) and she's running great. I put a set of Champions in a Northstar engine 4 years ago and they're working out fine too. I like NGKs (they were the only plugs that worked well in my BMW 635), but as long as you use Iridiums, I don't think the manufacturer makes much difference.
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