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Factory oil specification for the 2020–2025 Nissan Altima.
Altima uses 0W-20 full synthetic. The CVT uses Nissan NS-3 fluid; Nissan recommends inspecting it and changing it around 60,000 miles under severe use. Iridium spark plugs last about 100,000 miles.
The first number (0W or 5W) is how the oil flows when cold — lower is better for cold starts. The second number (20 or 30) is how thick it stays when the engine is hot. "Full synthetic" is made in a lab, not refined from crude, so it lasts longer and protects better at high temperatures. Always use the viscosity your manual calls for — thicker is not better.
Change the oil at the interval above, or once a year if you drive less. If you tow, drive in extreme heat, or do lots of short trips, change it sooner.
