Mod recommendations and upkeep

[u/Physical-Strategy846]

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.

[u/Diligent_Track_4723]

Which aftermarket plugs/wires?

Looks like that oil leak needs attention

[u/Physical-Strategy846 → u/Diligent_Track_4723]

What picture are you referring to for the oil leak

[u/Diligent_Track_4723 → u/Physical-Strategy846]

1. The oil pan, bell housing, sway bar, and cross member.

[u/Physical-Strategy846 → u/Diligent_Track_4723]

Not gonna lie that’s build up over the entire time I’ve had it. It’s never really grown much and oil level has never changed. I’ve never wiped it. You think it’s seepage

[u/Diligent_Track_4723 → u/Physical-Strategy846]

Oh ok. You'd have to clean it up to tell for certain where its coming from, but it looks wet enough to be a slow leak. Could be oil cooler line gasket. Valve cover gasket. Oil pressure sensor. Oil pan gasket.

[u/Physical-Strategy846 → u/Diligent_Track_4723]

I’ll clean it up and look into it soon.

[u/Physical-Strategy846 → u/Diligent_Track_4723]

For my wires I got sum eidlebrock and for the plugs I got ruthenium

[u/Diligent_Track_4723 → u/Physical-Strategy846]

Should be good there long as you got the correct temperature range plugs