Vehicle report
Technical service bulletins are instructions a manufacturer sent its dealers about a known fault. They are not recalls and the work is usually not free, but they are the clearest signal of a problem the manufacturer already knows about.
CSC-1617624
NEWELL COACH: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. FLUID LEVEL FALLS IN MIDDLE RANGE OF TANK DUE TO INDICATOR LEVEL, FOR DIESEL EXHAUST FLUID (DEF), MAY BE INACCURATE. NO MODEL OR MODEL YEARS LISTED. *PE
Complaint counts are reports filed with NHTSA, not failure rates. A common model collects more of them than a rare one that breaks more often.