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I was going to ask you what plugs you are running but the folks here are tired of hearing my my song and dance on that subject. Personally I wouldn't use the iridium plugs. Like so many parts on these cars, the safest bet is to use whatever Volvo sells. They're a bit pricey so I installed NGK BKR6ES in both our 2.4NA and 2.5T cars with VERY satisfactory results. One of them has rolled well over 80,000 miles on the NGK's and still runs great. They're cheap enough ($1.50-$2.50 ea) that it's worth the financial risk to throw a set in there just to see what happens. Oh yeah, the auto parts store will tell you they're the wrong plugs for you car - ignore him/her.
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