What I learned on my 05 LiY 05 2500 Duramax was the hard way yet sme of it I just knew. Stock engines on this model in particular , regardless if you plugged up your engine or not eas rough. Ok yeah there is a glow plug, and this is supposed to help how when it's like 18 below & that's just because they tell you it's ok. Look there are certain things you can do and certain things you should never do. After 1 week if crucial week of life below zero in the mountains and foothills of TN I finally made it back to the player's of TN. Still hadnt escaped those winter winds though. Days were in the low 30's with wind chill of minus 15. At night it was goin to get wrse. This reminded me of a time when one of best friends uncles took off outside b4 he finished his plate & we didnt know what was goin on. He said go fetch ur man's blanket boyz tell ur dad to bring nana's as well. What he did was practically n design. Only downfall I see is how lng one can maintain a blanket made warmer for this period of time. Well we were gonna find out. So we cvrs em up and flew n here and we gonna get a little more dne each day. When we wen to establish our market share of this product and filed for patents on jus bout one or 2 items. That always works out.