Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Civic VX spark plugs ZFR4F-11 ZFR5F-11

Lovemy92vx · 04-24-2015, 01:19 PM

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.

04-24-2015, 01:19 PM	#7 (permalink)
Lovemy92vx EcoModding Lurker Join Date: Oct 2014 Location: California Posts: 50 Pearl - '92 Honda Civic VX Thanks: 26 Thanked 5 Times in 5 Posts	Zfr5f or 4? 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.