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What do you use now?

GM recommends ACDelco Fuel System Treatment Plus - Diesel. It's a bit pricey. After a little research, I think I'm going to try Stanadyne.

Took this last week to show as evidence to someone who didn't believe the mileage I get.

Thank you Rusty59! I had already initiated a return to Amazon. I'll cancel and keep it. Calculating the production date reminds me of Boolean math. I guess you can tell I'm new to diesel trucks. I really appreciate you gentlemen and this forum!

So, how old is this stuff? Per my (suspect) calculations, it was manufactured in 2021.

What is the towing capacity of the 2024 GMC Sierra 1500 Denali Duramax? 13,300 pounds 2024 GMC Sierra 1500 Overview The new GMC Sierra 1500 is rated for an available 4WD diesel towing capacity of up to 13,300 pounds when equipped with the 305-hp 3.0L Duramax Turbo-Diesel engine with a...

Here's my capacity sticker

Not sure. How do you tell?

I typically don't like black vehicles for that very reason. This is my first one. It was a compromise with my wife. She loves black vehicles and in order to give her consent to get this truck it had to be black. Also, it has the sliding back center window that our dog loves. So, it has something...

Here are some pictures . . . at last.

Just got a new GMC Sierra Diesel last week. 500 miles and loving it so far!