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Which NGK Spark Plug?

4K views 9 replies 5 participants last post by  HRTKD 
#1 ·
The NGKSparkplugs.com web site says DILFR5C11. The '07 Maintenance Manual says DIFR5A-11. I think the maintenance manual is slightly off since I can't find that plug. Instead, I think it should be DILFR5A-11, which I can find.

What is the difference between the "A" and "C" plugs?
 
#2 ·
This may help you: http://www.titantalk.com/forums/3152065-post5.html

K well i figured the VQ35 used the same plugs so this is true. I found this list.

List of spark plugs available in multiple heat ranges for the VQ35:

Brand-------------------Stock #-----------Heat Range

NGK Iridium
LFR5AIX-11---------- 4469------------- Stock heat range
LFR6AIX-11---------- 6619-------------1 step colder
LFR7AIX--------------2309-------------2 steps colder


NGK V-power (standard plug)
LFR5A-11------------- 6376-------------Stock heat range
LFR6A-11------------- 3672-------------1 step colder


Denso Iridium
IKH16------------------------------------Stock heat range
IKH20------------------------------------1 step colder
IKH22------------------5345-------------2 steps colder
IKH24------------------5346-------------3 steps colder
IKH27------------------------------------4 steps colder



The NGK in red is what i'm and others are using.
 
#3 ·
Thanks! I just ordered the ones you highlighted.
 
#5 ·
#10 ·
Spark plugs for the flex fuel Titan have a "D" in the part number.
 
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