Is NGK Iridium Ix Spark Plug (ZFR5FIX-11) the right ones? I ask because the service manual says to use PZFR5F-11.

I already have the former (ZFR5FIX-11) and I'm wondering if I should return them and get the PZFR5F-11.

Thanks.

 

The manual calls for Platinum Long Life that's why the code number don't match.

PZFR5F-11 = Long Life Platinum.
ZFR5FIX-11 = Long Life Iridium IX plugs

Both are compatible and they don't "Upgrade" from one and other both are different products all together. If you already have the Iridium IX don't send the back.

 

most of us use the NGK irid or irid IX (supposed to make you feel like a race driver)
Plats were stock in most (not all) years of the gen2 TL and gen3 went Irid for all years

Plats cost more and last fewer miles, per our megamod, who in 600,000 ++ miles - he has changed plugs several times (says denso last fewer miles too)

mining technology has now made iridium plugs affordable to the general public, Before they were the domain of small airplanes and race cars with $25 each plugs!!
and you coughed when hearing at 8 bucks each, first time at parts store lol
and the airplane uses 2 plugs per cylinder- yike$!

 

Thanks, guys. I don't have much time to be on here, just wanted to say that I stuck with the plugs I first asked about and for those who have been following my threads, there was no oil in my spark plugs and I ran a compression test and ther was no loss of compression nor was there a big disparity between each cylinder. I fixed the misfire issue by changing the ignition coils. A P1361 ans P1366 error code came up after we reset CEL. I bought the cam shaft sensor and I'm about to replace it. Will post photos when I get a chance and explain things further.

 

codes are CLUES and not always a direct answer to the problem at hand
Usually 1 or 2 coils go bad, did you replace all 6?
at least that's good insurance!