If you own a GMC Sierra 4.8, you may be curious about how much oil it requires. The good news is that it requires the same quantity of 5W-30 motor oil as the 5.3L V8: 6 quarts.
However, if you have a 4.3L V6 engine, the procedure differs somewhat. This engine requires 4.3 liters of oil (about 4.5 US Quarts). That is a slight reduction, but it is still sufficient to keep your engine operating smoothly.
Same holds true for the 4.3 Vortec engine. This vehicle requires 4.5 quarts of oil in the oil pan in order to operate optimally.
So, whether you have a 4.8 or 4.3, you can rest assured that your GMC Sierra requires 6 gallons of 5W-30 motor oil to run like a champ!