03-01-2025, 11:27 PM
mattkime wrote:
[quote=special]
WV reliability aside, I don't think VW makes spark plugs. They buy from Bosch, NGK, or other manufacturers. How did this happen?
tldr; there's speculation but nobody really knows why it happens
There's some speculation about counterfeit spark plugs https://www.ngkntk.com/newsroom/blog/emea/fake-or-not/
That said, I had bought them from a reputable seller. More info - https://eqtuning.com/blogs/technical-wri...park-plugs
...
But the one that broke (missing ground strap) was probably the original (factory installed spark plug). Correct? so even if you bought a fake one now to troubleshoot, that still leaves the question how did this happened with an original, GENUINE spark plug. I have never heard of this happening before, must be 1 in a million changes this happens on a 7 year old plug with 70k miles on it.
Most owners manuals say to replaced at 90k-120k miles, at least on my Japanese and American cars. I never owned a VW so I don't know what they recommend, but I can't imagine you already replaced these before 70k and got a fake that caused the engine damage.