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Each 2001 INFINITI QX4 model is equipped with the same 3.5 V6 engine, simplifying the process of determining oil type and capacity. Regardless of the trim level you have, you should use 5.3 quarts of SAE 5W-30 full synthetic motor oil. In emergency situations where SAE 5W-30 is not available, you can temporarily use SAE 5W-40, SAE 10W-30, or SAE 10W-40. However, it is not recommended if avoidable. Opting for an engine oil with a higher weight introduces friction through thicker oil, leading to premature engine wear and tear, ultimately causing premature engine failure. Therefore, it is recommended to stick to the manufacturer's suggested oil with the lowest weight, even if it means spending a little extra on each oil change.
For the 2001 Infiniti QX4, you'll need to use 5 quarts of SAE 5W-30 oil.