I'm in the middle of this myself. Lots of opinions about plugs. I pulled mine out when I bought the car just to have a look and they say "Volvo". More than likely Bosch. Mine are platinums. I don't recall if there was any information stamped into the metal that could be helpful. I've been to Autozone and all they have is the incorrect Champion. I may just pull one again and look for any markings that might help me cross to an NGK. I'll pass on what I find.
BTW, I have about 8,000 miles on these since buying the car and have had no problems.
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Erwin in Memphis, '95 855t
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