I f you’ve been keeping up with our Mercedes Sprinter van saga, you know the backstory: My family’s pet roster includes a couple of mules, and for years we’ve owned a pickup truck expressly for equine ...

First, some housekeeping: Around 13,000 miles, the Sprinter began intermittently asking for a quart of oil. I’m usually a maven about checking oil, but the Sprinter’s 2.0-liter turbodiesel I-4 has no ...