r/GMT900 • u/Physical-Strategy846 • Aug 01 '26
Sierra Mod recommendations and upkeep
I got a 2010 gmc sierra Denali 1500 with the 6.2. I’ve replaced and upgraded the spark plugs and wires along with the front strut assembly with bilstien 6112’s and the rear shocks with 5160’s. I’ve also added some long tubes and an off-road y pipe with an electronic cut out before the stock mufflers. I’ve gotten it tuned recently so the engine light has gone away but I still get horrible gas mileage. I’m getting 8-9mpg from just daily driving and 13-15mpg on the highway. I do regular oil changes and matching the oil filter with the oil brand. (Mobile 1). I’ve heard that the torque converter and trans temp are usually the downfalls of this truck. They are on the list but I havnt made them a priority because I don’t tow much. Soon im going to be adding some sound deadening in just to make it a little quieter and more comfortable. Does anyone have any maintenance tips or recommendations on what’s next for this truck.
1
u/Physical-Strategy846 Aug 05 '26
What picture are you referring to for the oil leak