2010 Toyota Highlander Owners Manual - Page 467

4-3. Do-it-yourself maintenance n Recommended viscosity (2.7 L 4-cylinder (1AR-FE) engine) SAE 5W-20 or 0W-20 engine oil may be used. However, SAE 0W-20 is the best choice for good fuel economy and good starting in cold weather. Outside temperature n Recommended viscosity (3.5 L V6 (2GR-FE) engine) Without towing package SAE 5W-20 is the best choice for good fuel economy, and good starting in cold weather. Outside temperature With towing package SAE 5W-30 is the best choice for good fuel economy, and good starting in cold weather. *: If SAE 5W-30 oil is not available, SAE 10W-30 oil may be used. However, it should be replaced with SAE 5W-30 at the next oil change. Outside temperature 442