OP
Dan in Pasadena
Well-known member
Is his
When I bought my ‘21 used the very first thing I did was take it to the dealer and have ALL the fluids and filters changed to start off fresh. The service rep who I have come to respect told me to never use anything but #2 diesel in it. No Bio and no Renewable. I have.
He also told me to shut off the Autostop every time I start it, which I do.
Last he told me never ever to eff around with the software. No “tuning” or “deleting”. These trucks use sophisticated software to get the power they produce and still get great mileage but guys are always screwing with them. My feeling is if they wanted a faster truck they should have bought the 6.2 LS.
I’d buy another one in a minute if I needed a new truck.
They ARE “figured out”. Is his the Duramax?My cousin had nothing but problems with his. He's currently dealing with lemon law-ing it. Beautiful truck and drove awesome, but he had a terrible experience with it. I wish they could figure it out, because I'd definitely be looking at them
When I bought my ‘21 used the very first thing I did was take it to the dealer and have ALL the fluids and filters changed to start off fresh. The service rep who I have come to respect told me to never use anything but #2 diesel in it. No Bio and no Renewable. I have.
He also told me to shut off the Autostop every time I start it, which I do.
Last he told me never ever to eff around with the software. No “tuning” or “deleting”. These trucks use sophisticated software to get the power they produce and still get great mileage but guys are always screwing with them. My feeling is if they wanted a faster truck they should have bought the 6.2 LS.
I’d buy another one in a minute if I needed a new truck.












