Changing the oil on a 2006 Nissan is a straightforward maintenance task that begins by warming the engine for a few minutes so the oil flows more easily, then parking on a level surface, turning off the engine, and securing the vehicle. Raise the front of the car if needed, place a drain pan beneath the oil pan, remove the drain plug, and allow the old oil to drain completely before reinstalling the plug with a new crush washer if required. Next, remove the old oil filter, lightly coat the gasket of the new filter with fresh engine oil, and install it hand-tight. Refill the engine through the oil filler cap with the manufacturer-recommended type and amount of oil specified for your particular 2006 Nissan model and engine, as capacities vary. Start the engine and let it idle for a minute while checking for leaks around the drain plug and filter, then turn it off, wait a few minutes for the oil to settle, and verify the level with the dipstick, adding more oil if necessary. Finally, dispose of the used oil and filter at a recycling center or auto parts store that accepts used motor oil.