It should use 5W-30. It will say on your oild cap, but that is probably what is recommended.
The 2001 Yukon Denali has a very poor gas mileage per gallon. The gas tank capacity in these vehicles are 26 gallons.
where is blower motor resister located on 2001 GMC Yukon
DEXRON iii ATF
If fluid is full - bad sensor?
Use an 80-90wt gear oil
they cannot or the clutches will burn out
Trouble code P0440 means:Evaporative emission control system malfunction
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.
The windshield reservoir on a 2001 Yukon XL is removed by taking out the retaining bolts and disconnecting the pump motor. The reservoir can then be pulled from its mounts and lifted from the vehicle.
Your local wrecking yard should have a "Hollander" interchange manual; this info will be located there.
The 2001 GMC Yukon has a V8 engine.