Explore Part-Grade A used engines for the 2009 Nissan Altima—choose the fuel-efficient 2.5 L I4 (≈175 hp, 180 lb-ft) or the powerful 3.5 L V6 (≈270 hp, 258 lb-ft). All units include free shipping and a 3-year/30,000-mile warranty. Restore smooth, confident driving today!