>> the glowplugs often break when removal is attempted
The smaller, 220 and 270 diesel engines are shared with the Sprinter van. At 120,000 - 150,000 miles when you go to change the glowplugs, you find that electrolytic corrosion between the plug threads and the cylinder head has seized the plugs in solid. The usual remedy is to take the head off and drill them out from the inside... New head sometimes needed as a last resort, that's where the forecasted big costs come from. A Mercedes specialist will be clued up on ways around the problem.
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Mercedes Benz E-Class W210 - 01 3.2 Chec.. new