I've sold an oil change to a few semi guys that come into work. They typically buy three cases of Delo or Rotella (6 gallons to a case). We don't sell the oil filters, but one guy showed me a ticket for one: $92.
That makes them around $200/oil change.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne