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Recommended SAE viscosity number

  • 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.

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

Engine oil viscosity (thickness) has an effect on fuel economy and cold weather operating (engine start and engine oil flow ability). 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. Using oils of any viscosity other than those recommended could result in engine damage.

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

Temperature

°C

(°F)

 2025 Hyundai Tucson temperature scale header image. It displays Celsius values from -30 to 50 and Fahrenheit values from -10 to 120 arranged horizontally. It explains the temperature reference for selecting the recommended engine oil viscosity.

Smartstream G2.5 GDi *1

 2025 Hyundai Tucson recommended engine oil viscosity image. A dark horizontal bar displays the text '0W-20' in white. It describes the recommended SAE viscosity number for the engine oil.

Smartstream G2.0 *1

 2025 Hyundai Tucson recommended engine oil viscosity image. A dark horizontal bar displays the text '0W-20' in white. It describes the recommended SAE viscosity number for the engine oil.

Smartstream G1.6 T-GDi *1

 2025 Hyundai Tucson recommended engine oil viscosity image. A dark horizontal bar displays the text '0W-20' in white. It describes the recommended SAE viscosity number for the engine oil.

Smartstream D2.0

 2025 Hyundai Tucson recommended SAE viscosity chart for the Smartstream D2.0 engine. Three horizontal bars labeled '10W-30/40', '5W-30/40', and '0W-20/30' indicate suitable temperature ranges, with 0W-20/30 covering the lowest temperatures. Explains the selection of engine oil viscosity based on the operating temperature range.

If mineral oil or semi-synthetic oil is used, it is a severe maintenance condition in terms of engine oil change.

2025 Hyundai Tucson API Certification Mark icon. A starburst-shaped seal features the text 'AMERICAN PETROLEUM INSTITUTE' along the top arc, 'FOR GASOLINE ENGINES' in the center, and 'CERTIFIED' along the bottom arc. Explains the symbol used to identify engine oils that conform to ILSAC standards.

USA_API

An engine oil displaying this 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.