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The 2001 GMC Sierra 1500 requires 4 quarts of transmission fluid for the 5-speed manual and 13.5 quarts for a full fill, or 7.7 quarts for a partial fill for the 4-speed automatic. For the 4-speed automatic, it is recommended to use Dexron VI fluid, while for the 5-speed manual, Synthetic gear oil GM P/N 12346190 or an equivalent should be used. Transmission fluid functions as both an oil and a hydraulic fluid, aiding in gear shifts, cooling the transmission, and lubricating moving components. It is advisable to replace the transmission fluid every 30,000 miles. If you opt for a mechanic to perform the fluid change, expect labor costs ranging from $170 to $220.
In 2001, the GMC Sierra offers different engine options with varying oil capacities. The V8 engines - 4800, 5300, 6000, and 6600 - require 6.0 quarts (5.7 liters) of oil, the V6 4300 engine needs 4.5 quarts (4.3 liters), and the V8 8100 engine requires 6.5 quarts (6.1 liters) of oil.