I've found references online that the 4 digit alpha numeric code stamped on the hex of NGK made plugs is supposed to be the build date but I can't find out hot to decode it, I have some plugs that are stamped M78K and some that are stamped M82P that I've removed from vehicles and I was curious to know approximately when they were manufactured to give me an idea if the plugs in the cars were ever replaced or if they were the original factory plugs. Does anyone know how to decode these date codes?
NGK Plug Date codes.
- Thread starter blufeb95
- Start date
AutoMechanic
Site Donor 2024
I remember seeing a YouTube video on how to decode it and the guy showing a chart but I can’t remember what channel it was. It’s been a little since I seen it otherwise I could find it in my watched history.
If it's gonna take a long time to find it don't worry about it, I sent an email to NGK, I figure it may take a few days to get a response, but they seem to be pretty forthcoming to inquiries.
AutoMechanic
Site Donor 2024
Yep if they do reply let us know here cause I want to remember how to do it lol.
Took about 30 seconds to find this from NGK
Global Networks｜NGKスパークプラグ/NTKテクニカルセラミックス製品サイト
NGKスパークプラグ／NTKテクニカルセラミックス製品サイトの「Global Networks」ページです。
www.ngk-sparkplugs.jp
I'm not seeing anything on the page about how to decode the lot code.
