Dt466 not the best on mpg with auto usually around 7-8 stick shift would be better I've got no issues with mine which is way more than I can say for my m2 with Mbe 900
Power is ok just make sure you don't get the 190 hp 210-280 is best lots of 190s are old rental trucks . If you can get one...
sounds just like the turbo blew out and filled the charge air cooler with oil spray causing the engine to run away out of control. good luck, hate being bearer of expensive news, but it wont be cheap, keep us posted
I would think all the mechanics in a dealership would know what they're doing (wishful thinking) its amazing many t freightliner dealers are clueless on the special spec oil for a mb manual trans!!