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I assume you don't have an owner's manual or a sticker under the hood? I also assume that you are not running a tuned ECU? So why are you messin' with the plugs? Your Viggen has the T7 management system which uses the plugs to check for pre-detonation (= melted pistons) among other parameters. Don't mess with the plugs unless you're feeling particularly lucky or you have a reason to WANT to rebuild the engine. This is no place to save a few $$!!
Owner's manual says NGK PFR 6H-10 gapped to .95mm (.03740") torqued to 28 Nm (20 ft/lbs)
Best of luck
posted by 70.54.95...
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