The 2001 Yukon Denali has a very poor gas mileage per gallon. The gas tank capacity in these vehicles are 26 gallons.
DEXRON iii ATF
A 2001 GMC Yukon Denali typically has a coolant capacity of around 12 quarts (or 3 gallons) when including the engine and radiator. However, the exact amount of antifreeze can vary slightly depending on whether you are including the entire cooling system or just the radiator. It's important to refer to the owner's manual for specific details regarding your vehicle's cooling system.
If fluid is full - bad sensor?
Use an 80-90wt gear oil
The gas tank on the 2001 GMC Yukon holds 26 gal..
they cannot or the clutches will burn out
Trouble code P0440 means:Evaporative emission control system malfunction
The gas tank on the 2001 GMC Yukon-XL holds 32.5 gal..
In the 2001 GMC Yukon Denali, the factory amplifier is typically located behind the rear passenger side panel, near the back of the vehicle. To access it, you may need to remove the trim panel or the carpeted cover in that area. This amplifier is part of the premium audio system, enhancing sound quality throughout the vehicle.
It should use 5W-30. It will say on your oild cap, but that is probably what is recommended.
Your 2001 gmc Denali is all time 4 wheel drive. It doesn't turn off. Only the slt, sl, and lower models have a push button 2 wheel to 4 wheel drive.
More than likely Dexron 3. Call your local GM dealer to be 100% sure.