Do you think your engine was made before April 20, 2015, was in storage and not installed into your van for almost a year? IMHO would not think Mercedes would have thousands of engines in storage for months.Not trying to scare everyone, but it was brought to my attention from a MB tech that on the M274 engine, there have been problems with an out of spec. wrist pin which causes piston slap. A tell tell sign is a noisey engine on start up. I know direct injection is loud. There is a service bulletin out now and MB is trying to keep it on the low down. It's TSB #L103-10P060916. It's on engines made before 20 April 2015 or serial number 400,000. My engine is louder than it should be, I believe and I understand the whole DI thing. Just wanted to throw it out there. Not sure if I'm going to take it in soon or not.