Bosch Glow Plugs are certainly cheaper, easier to find and entirly adequate.
Things like carbon build up on the Glow Plugs, worn out Injector Nozzles and other issues that effect the proper burning of Fuel in the Precombustion Chamber all effect the longivity of the Glow Plugs.
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84 300D, 82 Volvo 244Gl Diesel
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