Hyundai Sonata Maintenance Schedule (2021–2024)

DN8 Sonata (2021–2024): four engines, four schedules

The eighth-generation Sonata (platform code DN8, 2020–present) covers four distinct powertrains across the 2021–2024 model years:

• 2.5L Smartstream naturally aspirated GDI/MPI I4 — SE, SEL, SEL Plus, Limited
• 1.6L Smartstream turbocharged GDI I4 — SEL Plus, Limited (not in the 2024 manual)
• 2.5L Smartstream turbocharged GDI I4 — N Line
• 2.0L Smartstream GDI I4 hybrid — Hybrid Blue, SEL, Limited

Each engine has its own oil, spark-plug, and coolant schedule, and several intervals shift again by model year. The figures below come from Hyundai's maintenance booklets, verified September 24, 2026. Where an interval changed between years, both are listed. Where the manual says "no fixed interval," the entry explains why. Where two model years give the same figure but the underlying note differs — a severe condition list, an inspection column, a revised printing — that difference is called out too, so you're not applying a 2021 rule to a 2024 car.

Model year matters more on the Sonata than most owners assume. Hyundai revised the coolant follow-up interval, the N Line's plug life, and the hybrid's brake-fluid schedule all within this four-year window, and none of those changes are obvious unless you compare manuals side by side.

For other Hyundai models, see the Hyundai maintenance schedule overview.

Engine oil and filter

2.5L naturally aspirated and 1.6L turbo, 2021–2024: every 8,000 miles or 12 months. Severe service: every 5,000 miles or 6 months. Both require API SN PLUS full synthetic oil. The 1.6L turbo does not appear in the 2024 maintenance booklet, so its entries here stop at the 2023 manual.

2.0L hybrid, 2021: every 7,500 miles or 12 months.

2.5L turbo (N Line), 2022–2024: every 8,000 miles or 12 months. Severe service: every 5,000 miles or 6 months.

2.0L hybrid, 2022–2023: every 8,000 miles or 12 months. Severe service: every 5,000 miles or 6 months if you're running oil below the recommended grade.

The hybrid's normal interval moved from 7,500 miles in 2021 to 8,000 miles from 2022 on. For the 2022–2023 hybrid, Hyundai's manual ties the 5,000-mile, 6-month severe interval to lower-grade oil.

Transmission and drivetrain

Automatic transmission fluid — 2.5L naturally aspirated and 1.6L turbo, 2021–2024: no fixed interval under normal driving; the manual specifies "no check, no service required." Severe service under conditions A, C, E, F, G, I: replace every 60,000 miles.

Automatic transmission fluid — 2.0L hybrid, 2021–2023: no fixed interval under normal driving ("no check, no service required"). Hyundai lists no severe-service figure for the hybrid's transmission fluid.

Dual-clutch transmission fluid — 2.5L turbo (N Line), 2022–2024: inspect at 32,000 miles or 48 months, and again at 96 and 144 months. Severe service: replace every 64,000 miles per the 2022 manual, every 56,000 miles per the 2023–2024 manuals.

The N Line's DCT is the only Sonata transmission with a fixed inspection schedule — every other engine in the lineup runs "no check required" under normal driving.

Brakes, cooling and spark plugs

Brake fluid — 2.5L naturally aspirated and 1.6L turbo, 2021–2024: replace every 48,000 miles or 48 months; inspect every 8,000 miles or 12 months.

Brake fluid — 2.0L hybrid, 2021: replace every 60,000 miles or 48 months; inspect every 7,500 miles or 12 months.

Brake fluid — 2.5L turbo (N Line), 2022–2024: replace every 48,000 miles or 48 months.

Brake fluid — 2.0L hybrid, 2022–2023: replace every 48,000 miles or 48 months; inspect every 8,000 miles or 12 months.

The hybrid's brake-fluid replacement interval dropped from 60,000 miles in 2021 to 48,000 miles from 2022 on, and the inspection interval lengthened from 7,500 miles to 8,000 miles at the same time.

Engine coolant — 2.5L naturally aspirated and 1.6L turbo, 2021–2022: first replacement at 120,000 miles or 120 months; every 30,000 miles or 24 months after that.

Engine coolant — 2.0L hybrid, 2021–2023: engine and inverter coolant, first replacement at 120,000 miles or 120 months (the manual states this as "10 years"); every 30,000 miles or 24 months after that.

Engine coolant — 2.5L turbo (N Line), 2022: first replacement at 120,000 miles or 120 months; every 30,000 miles or 24 months after that.

Engine coolant — 2.5L naturally aspirated, 1.6L turbo, and 2.5L turbo (N Line), 2023–2024: first replacement at 120,000 miles or 120 months; every 24,000 miles or 24 months after that — Hyundai shortened the follow-up interval from 30,000 to 24,000 miles starting in 2023.

Spark plugs — 2.5L naturally aspirated, 2021–2024: every 96,000 miles. Severe service under conditions A, B, F, G, H, I, K: more frequently.

Spark plugs — 2.0L hybrid, 2021–2023: every 100,000 miles.

Spark plugs — 1.6L turbo, 2021–2022: every 40,000 miles or 60 months, replaced at both the 60-month and 120-month (40,000-mile and 80,000-mile) service columns.

Spark plugs — 1.6L turbo, 2023: every 48,000 miles.

Spark plugs — 2.5L turbo (N Line), 2022: every 96,000 miles.

Spark plugs — 2.5L turbo (N Line), 2023–2024: every 48,000 miles — the N Line's plug interval was cut in half between the 2022 and 2023 manuals.

Filters

Engine air filter — 2.5L naturally aspirated and 1.6L turbo, 2021–2024: replace every 24,000 miles or 36 months. Severe service under conditions C, E: more frequently.

Engine air filter — 2.0L hybrid, 2021: replace every 30,000 miles or 48 months, at every fourth column of the 7,500-mile service table.

Engine air filter — 2.5L turbo (N Line), 2022–2024: replace every 24,000 miles or 36 months.

Engine air filter — 2.0L hybrid, 2022–2023: replace every 24,000 miles or 36 months.

Cabin air filter — 2.5L naturally aspirated and 1.6L turbo, 2021–2024: replace every 16,000 miles or 24 months. Severe service under conditions C, E: more frequently.

Cabin air filter — 2.0L hybrid, 2021: replace every 15,000 miles or 12 months.

Cabin air filter — 2.5L turbo (N Line), 2022–2024: replace every 16,000 miles or 24 months.

Cabin air filter — 2.0L hybrid, 2022–2023: replace every 16,000 miles or 24 months.

The hybrid's filter intervals moved closer to the rest of the lineup after 2021: the engine air filter went from 30,000 to 24,000 miles, and the cabin filter went from a 15,000-mile, 12-month cycle to 16,000 miles and 24 months.

The easy-to-miss items

Drive belt inspection — 2.5L naturally aspirated and 1.6L turbo, 2021–2024: first inspection at 48,000 miles or 72 months; every 8,000 miles or 12 months after that.

Drive belt inspection — 2.5L turbo (N Line), 2022–2024: first inspection at 48,000 miles or 72 months; check your owner's manual for any repeat inspection after that.

Hybrid starter-generator belt — 2.0L hybrid, 2021: inspect every 7,500 miles or 12 months; replace every 67,500 miles or 48 months.

Hybrid starter-generator belt — 2.0L hybrid, 2022–2023: inspect every 8,000 miles or 12 months; replace every 72,000 miles or 48 months.

Brake inspection — 2.5L naturally aspirated and 1.6L turbo, 2021–2024: every 8,000 miles or 12 months.

Brake inspection — 2.0L hybrid, 2021: every 7,500 miles or 12 months.

Brake inspection — 2.5L turbo (N Line), 2022–2024: every 8,000 miles or 12 months.

Brake inspection — 2.0L hybrid, 2022–2023: every 8,000 miles or 12 months.

Battery inspection — 2.5L naturally aspirated and 1.6L turbo, 2021–2024: every 8,000 miles or 12 months.

Battery inspection — 2.0L hybrid, 2021: every 7,500 miles or 12 months.

Battery inspection — 2.5L turbo (N Line), 2022–2024: every 8,000 miles or 12 months.

Battery inspection — 2.0L hybrid, 2022–2023: every 8,000 miles or 12 months.

Tire rotation — 2.5L naturally aspirated and 1.6L turbo, 2021–2022: every 8,000 miles.

Tire rotation — 2.0L hybrid, 2021: every 7,500 miles.

Tire rotation — 2.5L turbo (N Line), 2022: every 8,000 miles.

Tire rotation — 2.0L hybrid, 2022: every 8,000 miles.

Tire rotation — 2.5L naturally aspirated, 1.6L turbo, and 2.5L turbo (N Line), 2023–2024: every 8,000 miles or 12 months.

Tire rotation — 2.0L hybrid, 2023: every 8,000 miles or 12 months.

The N Line's dual-clutch transmission inspection is easy to miss, because no other Sonata engine has an equivalent fixed check on its transmission fluid. The hybrid's starter-generator belt is another: it is listed separately from the drive belt inspection and only applies to the hybrid powertrain, so check both its inspection and its replacement figure.