Hello! I am sure the good people on this forum will be able to answer this question once and for all, so thank you in advance! I have a 2017 RAM 1500 5.7 Hemi. I love this truck! I drive back and forth between states every few months (1300 miles one way). Most of the time my truck will show "ECO" mode and my gas mileage is phenomenal! However, both my brother and my mom's neighbor have told me that ECO mode is merely a marketing gimmick to get sales and that eventually my engine will "blow up" and need to be replaced because the 4 cylinders that aren't engaged when in ECO mode are not getting "lubed." Is there any truth to this? My brother says there are ways to permanently disable this mode and that I should do it before I "ruin my engine." Right now I have 13,000 miles on it. Thoughts very much appreciated, thank you!!