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I’m looking at the maintenance logs for our small fleet of sprinter vans and the sheer number of unscheduled repairs for the DEF system is becoming a real problem. We’re constantly dealing with sensors failing or injectors clogging, and it’s throwing our local delivery routes into chaos because a van is always in the shop. I’m starting to wonder if switching to a gasoline model for our last-mile runs, despite the fuel cost difference, would actually improve our uptime and reliability. Has anyone else made that calculation for their urban delivery operations?

Yep we looked at this last quarter. A few of our Sprinters kept throwing DEF codes and some sensors would fail after short trips, which sent a van to the shop right in the middle of the route. We tightened maintenance intervals and swapped to higher quality sensors, and a couple of cold-weather issues vanished, but the downtime still hovered. Not enough savings in fuel to justify swapping to gasoline for last mile.

We did a rough TCO for a small fleet— diesel with DEF vs gasoline for city routes. Gasoline saves a few tenths per mile on fuel, but you pay more for maintenance of spark plugs, ignition coils, and the more frequent refuels, plus potential reliability issues when the city cold starts. Bottom line: the downtime profile didn’t shift in our favor enough to justify the switch.

I’m in the shop every week because of clogged injectors and DEF heaters. The problem is noisy, expensive sensors and valves more than any single part, and sometimes it’s just contaminated fluid. Replacing parts buys a little time, but the pattern is not reliably better on GAS vans in our hands.

I keep circling back to whether the problem is the DEF stuff or the way we schedule deliveries. Maybe the real win would be better route optimization or staggered shifts so fewer vans have to run on the same hour. Do you think the problem is really uptime or the route mix?

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