How to Identify Imitation Spark Plugs? [from NGK website]
When I checked the factory fitted NGK platinum spark plugs on my Peugeot 308 I got these laser-print "four-digit number" on the bi-hex... "H7Z8." as shown in the picture below.
and also some numbers are stamped on the spark plug body [serial number or something?].
Genuine NGK electrodes [platinum tip and disc] at 40,000km!...
...the tip and disc are still shiny and intact - probably counterfeit tip and disc would have already vaporized at 40,000km.
What about "Laser Iridium" spark plugs which some of you and I bought on-line?
The welding around the electrode looks a little weird to me....
There is also no "four-digit number" stamped/printed on the bi-hex.
I decided not to use these "questionable" spark plugs. Investigation with NGK is in progress.
click on the image to enlarge
When I checked the factory fitted NGK platinum spark plugs on my Peugeot 308 I got these laser-print "four-digit number" on the bi-hex... "H7Z8." as shown in the picture below.
and also some numbers are stamped on the spark plug body [serial number or something?].
Genuine NGK electrodes [platinum tip and disc] at 40,000km!...
...the tip and disc are still shiny and intact - probably counterfeit tip and disc would have already vaporized at 40,000km.
What about "Laser Iridium" spark plugs which some of you and I bought on-line?
The welding around the electrode looks a little weird to me....
There is also no "four-digit number" stamped/printed on the bi-hex.
I decided not to use these "questionable" spark plugs. Investigation with NGK is in progress.
UPDATE: Received an email from Andrew Hauenstein, Technical & Training Specialist, NGK Spark Plugs (USA), Inc - Friday July 1st 2011
"The build date (four-digit code) should be marked vertically on the BI-Hex. Yes our Laser plugs are laser welded.... ",
So IMHO, NGK spark plugs without the "four-digit" code marking on the bi-hex could be fake or failed QC.
Monday, April 20, 2015
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