Recommended SAE viscosity number

Engine oil viscosity (thickness) has an effect on fuel economy and cold weather operating (engine start and engine oil flowability). Lower viscosity engine oils can provide better fuel economy and cold weather performance, however, higher viscosity engine oils are required for satisfactory lubrication in hot weather. Consider the range of temperature your vehicle will be operated in before the next oil change.

CAUTION

Always be sure to clean the area around any filler plug, drain plug, or dipstick before checking or draining any lubricant. This is especially important in dusty or sandy areas and when the vehicle is used on unpaved roads. Cleaning the plug and dipstick areas will prevent dirt and grit from entering the engine and other mechanisms that could be damaged.

NOTE

Never add any additives to the engine oil. Engine oil additives can change its properties of engine oil and may cause serious engine failure.

When choosing an oil, consider the range of temperature your vehicle will be operated in before the next oil change. Proceed to select the recommended oil viscosity from the chart.

Temperature Range for SAE Viscosity Numbers

Smartstream G2.5 T-GDi

A/B: All

2026 Kia Tasman recommended SAE viscosity number chart image. The table lists temperatures in Celsius and Fahrenheit. Row A '0W-20' and Row B '0W-30' show black bars spanning the full range from -30°C to 50°C. It describes the recommended oil viscosity for the Smartstream G2.5 T-GDi engine based on temperature.
Smartstream D2.2

A: All

2026 Kia Tasman recommended SAE viscosity number chart image. The chart displays temperature ranges for Smartstream D2.2 engine oil. The 5W-30 range starts from -30 degrees Celsius, while the 0W-30 and 0W-20 range extends from below -30 degrees Celsius. It explains the recommended engine oil viscosity based on ambient temperature.
2026 Kia Tasman API Certification Mark icon. The circular starburst symbol displays 'AMERICAN PETROLEUM INSTITUTE' on the upper rim, 'CERTIFIED' on the lower rim, and 'FOR GASOLINE ENGINES' in the center. It identifies engine oils that meet ILSAC standards.

An engine oil displaying this American Petroleum Institute (API) Certification Mark conforms to the International Lubricant Specification Advisory Committee (ILSAC). It is recommended to only use engine oils that uphold this API Certification Mark.