Oil on the back of the engine, on a 906 with the 3.0-liter V6, is almost always the oil cooler seal — the most common job on this platform, and the intake comes off to reach it. Nobody enjoys it. But a known job can be scheduled instead of feared, which beats discovering it on a Monday with a loaded van.

Glow plugs seize and snap, which turns a short job into a machining exercise when a van arrives in January after a month of hard cold starts. Swirl flap motors fail. Injector seals leak and carbon their way into the head. The 2.1-liter OM651 four-cylinder in later 906 vans has its own list — timing chain, injectors, turbo actuator — and its own intervals.

→ diesel engine repair and oil cooler seal work

Short city routes never let the diesel particulate filter finish a regeneration. The van heats up, gets shut off mid-cycle, tries again, fails again, and eventually throws a warning with a starts-remaining countdown that turns next week’s schedule into a crisis. Then somebody buys a filter.

Read the data first. Regeneration history, soot load, NOx sensor values, DEF quality and heater function, exhaust temperatures — those numbers say whether the van needs a part, a forced regeneration, a sensor, or one longer highway run each week. We would rather fix the route than sell you a filter.

→ emissions and check engine light diagnostics

Know which one you own. The 906, sold here from 2007 through 2018, is the van most Atlanta fleets still run, and its electrics, brake components and diesel plumbing all differ from the 907 that replaced it in 2019. The 907 brought new electronics, front-wheel drive alongside rear-wheel and 4×4, and a smaller four-cylinder diesel next to the familiar V6.

That difference matters when a part is ordered. It matters more when the same symptom calls for a software procedure on one generation and a mechanical fix on the other. Ask before you buy parts online. Said plainly: no factory Sprinter certification hangs on our wall, so what stands behind this work is ASE certification, dealer-level diesel scan software and the 3-year/36,000-mile warranty.

→ Mercedes-Benz car and van service

→ diesel ECU tuning for Sprinter torque and towing

Load rewrites the intervals. A loaded 3500 at its rating carries far more energy into a stop than an empty 2500. The wear tells on itself: pads and rotors go quicker, rear leaf springs settle, shocks fade, and front tires scrub their inside edges when nobody checks alignment against a working load. Weigh the van the way you use it.

Tire pressure is the cheapest item here and the most ignored. Set it for the load on the door placard, not for what rides nicely empty. Then check alignment at the end of a heavy season, before a scrubbed inside edge turns into four tires.

→ van suspension, springs and shocks

→ wheel alignment after a heavy season