Well they responded that the twin coil technology is also used in the pencil plugs that fit our car as well as the earlier open loop design. I really hope this whole area does not turn out to have been a total oversight on our part. I would not have found these glow plugs unless trying to find a better plug than the ac delcos for the 6.2 and 6.5s in my opinion.

I wonder if I could get them to mail me a set gratis for evaluation. It did not suprise me that they did not respond to the other question about the champion and autolight glow plugs.

Those glow plugs are so poor as to be not deserving an answer hopefully. Anyone on site know who built those latter two brands. I will ask on the champion and autolite sites on the internet and get back once again with whatever answer if any I get.