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Sorry, no first hand experience with 3+ ohm 12v coils. I'm still using a ~50 year old 1.5+ ohm can with external resistor. Mounted away from engine heat. But I've read that German made Beru & Bosch Blue are likely more reliable and heat tolerant than SMP, Pertronix or never-of-them 3+ ohm coils. Jack E/NJ