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Spark plugs - non O.E.?

5025 Views 13 Replies 10 Participants Last post by  srmarti
Has anyone experimented with non-OE (i.e. non-Iridium) plugs in our ICEs?

It has been a long standing argument among the VW community (cars in the 2000s and newer generations) that you get (significantly?) better fuel economy with Copper plugs over Iridium at the cost of the plugs wearing out 2-3x faster.

At present I drive a lot of ICE miles, so I'd be willing to Guinea pig myself if I can determine what plugs are "compatible"
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I had a 72 Dodge Dart Demon. 340ci V-8 that was tuned up pretty well and had the kind of strong engine that pulled 0-60 in about 6.7sec and regularly pulled mid 15's on the 1/4 mile drag strip.

I used to run some slightly "hotter" plugs in it trying for more "juice" and about the only thing it seemed to do was make the car start a little easier. I tracked absolutely NO difference in horsepower (had access to a dyno) or MPG or 1/4 mile speed or anything.

1997 Jeep Cherokee, decided to try some "fancy" NGK plugs one time and it was astoundingly awful. Lowered MPG, one cylinder fouled (which had NEVER happened before). Truly a disaster. I went back to the stock Champion plugs and have been happy for the last 160+k miles.

My own personal experience has been that the factory recommended plugs are generally about the best thing you can put in a regular commuter car.
20K replacement cycle is 1-2 years for more drivers. There is no way I'd want to change spark plugs that often. Good luck on your tests and please report back. :)
LOL... yup, it was plugs, distrib cap, and rotor every damned year on the Jeep for a while.
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