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Should I use heat range 7 or 6?? 6 is standard and 7 is for mild tuned but I was thinking how hot these things get then 7 maybe a better option even though my car is not tuned??
Because the PFR series are double platinum - both the electrode and the ground are platinum tipped, and so are more durable than the IX ones, where only the electrode is iridium
Last edited by Splitpin; 09 February 2010 at 06:18 PM.
Although they worked fine, on replacing the iridiums in my engine, I found the ground electrode had a noticable crater which had the effect of increasing the effective gap.
Because PFR7B are cost effective, work well, last a long time and are reliable.
Do not be taken in by the glossy advertising for iridium.
I and others have had iridium insulators break. Cost me a cylinder head and turbine wheel.
08 February 2010, 01:24 PM
NGK IRIDIUM IX SPARK PLUGS
