(1) Select appropriate quality level by referring to “Vehicle Manual”, for instance, SF gasoline engine oil shall be at least selected for Santana and Jetta, and you may make adjustment accordingly dependent on your vehicles, for instance, you should select engine oil of a relatively high quality level since the engine oil deterioration would be accelerated when city taxi usually starts and stop, trucks travel for a long distance under heavy load, or vehicles run under dusty condition.

(2) Select viscosity grade depending on the weather
Select the appropriateviscosity grade by referring to the following diagram, and ensure smooth startup of engine under low temperature and engine lubrication and sealing under high temperature. In addition, the engine oil commonly for winter and summer, namely multi-grade oil should be selected, for instance, 15W-40is suitable for application ranging -15 degrees Celsius to +40 degrees, applicable all the year round in the region with moderate climate and above all, multi-grade oil can effectively reduce engine wear and save fuel for its low temperature performance and ideal viscosity.

Note: as to diesel trucks especially heavy-load diesel trucks, if they are free from startup problems under low temperature, don't choose multi-grade oil, otherwise it would cause oil pressure alarm, namelythe red light is on.