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The 2001 Toyota Tundra offers two engine choices that impact the oil capacity. If you have the 3.4L V6 engine, it requires 5.5 quarts of SAE 5W-30 synthetic oil. For the larger 4.7L 8-cylinder engine, the capacity is 6.6 quarts of the same oil. While you could use SAE 5W-40 conventional oil in a pinch, it's not advised. Understanding oil weights is critical here. The numbers indicate the oil's viscosity at startup and operating temperatures. Opting for the SAE 5W-40 may not be suitable as it has lower viscosity at operating temperatures, leading to premature engine wear if used long-term.
The standard 3.4L V6 engine in the 2001 Toyota Tundra needs 5.5 quarts of 5W30 oil for any temperature or 10W30 oil for temperatures above 0 degrees Fahrenheit. For the upgraded 4.7L V8 engine, you'll need 6.6 quarts of 5W30 oil for all temperatures or 10W30 oil for temperatures above 0 degrees Fahrenheit.
The temperature range within which something can function efficiently.