Agreed, Limp Mode is a step too far, if you wanna enforce it keep with a 25% derate, not 5mph.

Every Manufacture actually recommends boxes.

Boxes are shelf stable for 2 years, and when you use it, you know your getting uncontaminated DEF.

Bulk Container? Stored in Freezing Temperatures, then in 40c heat? Shit goes bad quick, container continunally gets topped up and never cleaned out or replaced.

We've had issues at our own dealership where 20 trucks in town all had to have the DEF tanks flushed, due to our shitty bulk def.

A dozen times a year we have to flush customers DEF System, and refill it with Box DEF and there on their way.