For the 2018 Sonata, Hyundai typically suggests an oil change interval of 5,000 to 7,500 miles when using full synthetic oil. The "W" stands for winter, indicating the oil's cold-flow properties, while the number after the dash denotes high-temperature viscosity.
2018 Sonata Recommended Oil Viscosity for Optimal Engine Performance
Oil Change Interval and Capacity Following the recommended maintenance schedule is vital for the health of the engine. 6-liter turbocharged variant, both of which have specific requirements to operate optimally.
For the 2018 models, the factory fill and recommended replacement oil should meet the API SN PLUS specification. Synthetic oil is engineered to provide superior protection, especially in extreme temperatures, which is crucial for the turbocharged 1.
2018 Sonata Recommended Oil Viscosity for Optimal Engine Performance
This rating ensures the oil provides necessary protection against low-speed pre-ignition (LSPI), a potential issue particularly in turbocharged and direct-injection engines. The base engine is the 2.
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