Bosch plugs are about $1 each for that car. Why are the plugs out in the first place? Something is not right.

Anyway as with any M116 make sure the chain has been done. At 148k if it hasn't it probably broke.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200