GMC : NEW DURAMAX 6.6L DIESEL INTRODUCED ON 2017 SIERRA HD September 29, 2016 By Tyler Hopper 0 SharesTweetSharePinShare GMC today announced the redesigned Duramax 6.6L V-8 turbo-diesel offered on the 2017 Sierra HD. This next-generation red Read more here:: Newspress 0 SharesTweetSharePinShare