Quote:
Originally Posted by Lovemy92vx
The dealer i just talked to said both of these plugs (zfr5f & zfr4f) are ngk iridium and that they are the exact same plug other than the stamp.
I am trying to re-gain 10 mpg lost after a tune by a guy unfamilar with the special nature of the VX.
I also have a 97 HX to double check.
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Tune? There is no such thing. you mean tune up?
Both plugs are copper core but the plug looks polished like a platinum plug but the core is copper