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I've had terrible luck with anything in my worn out Volvo 1800 except basic old copper core Bosch Supers. Ditto with my Jaguar which has a new engine. The Supers seem to be good for 75k miles (and counting), others I've tried lasted anywhere from 5 miles to perhaps a couple thousand. Then I'd put my used Supers back in.
When it comes to plugs, I fear change. And I really fear the day that Bosch Supers are no longer available. I won't buy anything else. But hey, if you have a good engine...what the heck. Can't hurt anything but your pocket book.
-matt
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