I installed 4 of 6 GP's because I have 2 old blown glow plugs in my engine. My Sprinter immediately threw codes on all four cylinders that were swapped out. I checked the resistance of two other GPs that I haven't installed and both gave me 6.8 ohms. Too high. I tested one with leads and it blew out within seconds. I assume that the four installed blew out immediately. Unfortunately I have to send them back and use a different brand.
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