Excellent replies. My thoughts on this are as varied as your comments.
No way these plugs are original, rig has 275,000 ticks on the clock. With my stoopid 300k Subie, I replaced things essentially to factory ( NGK plugs ) and the thing purrs all day.
Hoping to strike twice-ish with this one. Clean car, no leaks or creaks, minimal warts for it's miles, considering.
I think factory plugs are iridium. Going with NGK.
Biggest reason I axed here is because somebody has this engine in something.
And you guys fairly rock...on occasion.
Don't forget the chicas!!