2008 Toyota Highlander Owners Manual - Page 1018

4-3. Do-it-yourself maintenance n Recommended viscosity Without towing package 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. 4 Outside temperature Maintenance and care n How to read oil container labels Some oil containers are labeled with ILSAC certification marks that help you to select the proper oil. 423