i'd been getting increasingly harder starts in cold weather. i just pulled all five glow plugs and replaced with new bosch duraterms. all five i pulled were beru, and four of the five were stamped made in west germany!! i dont know how long it took after reunification for them to retool the factory, but these had to be at least 21-22 years old. they all checked "OK" using the relay ohm test.. but almost all of them had burnt down tips. check your glow plugs!!!

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1981 NA 300D 310k miles