98 E300 is at the mechanic to replace the #5 glow plug (original). All that it needs to pass inspection. Intake manifold is off and mechanic, trying all the usual tricks, doesn't think the plug is going to come out. So my son needs to figure out what to do. Mechanic has not had good results over the years trying to deal with a broken plug on the 606 with the head in place. So, if we were to fix it, he would lean in the direction of finding a replacement head. Obviously big $$$. But cheaper than buying a new car.

Furthermore, mechanic has seen instances where, when a plug breaks, it breaks in such a way that compression is lost.

I guess my inclination is to apply more torque and see what happens.

Other than AC which is prohibitively expensive to repair, car is well maintained with relatively low miles. Some rust but not much.

Thoughts?

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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife