I used to get new plugs not on the market yet to try out and report back. That stopped a few years ago as the R&D was reduced to a token staff. That company is now starting to see problems, A few warranties show up then the shops find a new brand. This problem is not only with spark plugs. Good luck trusting R&D as you have for many years.
You will have no problems with your car, As the plugs and plug holes are kept far above average, not a fair test for all of us.
You will have no problems with your car, As the plugs and plug holes are kept far above average, not a fair test for all of us.
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