I used them on a 2010 GLK 350 4Matic with 180,000 miles. Since I was doing my second spark plug change, I decided that at this price point it made sense to change the coils as well. The quality was excellent. I "pulled" a bit to make sure everything was done well and everything was perfect and tight. I appreciate that it comes with a small amount of grease to seal the dust boots on the connectors to keep moisture out. Now the car runs great.
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