OIL SEAL Description
21421-35520 OIL SEAL: Hyundai-Kia Theta II Guide
Front Crankshaft Main Seal | Sonata, Santa Fe, Optima & Sportage
The 21421-35520 OIL SEAL is the essential engine component designed to restore the lubricant integrity of your Hyundai or Kia 2.0L / 2.4L Theta II engine. This professionally engineered seal ensures maximum protection against oil leaks at the crankshaft front, consistent internal pressure, and superior structural integrity under the extreme thermal cycles of modern high-output engines. This component is critical for maintaining the professional performance of your vehicle’s original engine configuration.
21421-35520 OIL SEAL Fitment
- Hyundai Sonata (YF/LF): 2009–2019
- Hyundai Santa Fe (DM): 2.4L Theta II
- Kia Optima (TF/JF): 2.0L / 2.4L GDI
- Kia Sportage (SL/QL): 2.0L / 2.4L
- OE Part Number: 21421-35520
Technical Engine Specs
- Engine Family: Theta II / Theta II GDI
- Position: Front Crankshaft
- Material: Specialized Fluorine Rubber (FKM)
- Type: High-Pressure Radial Shaft Seal
- Standard: OE Precision Engineering
Benefits of 21421-35520 OIL SEAL
Choosing this specific sealing unit is vital for protecting your vehicle’s serpentine belt and alternator from oil spray. Because Theta II engines utilize high internal pressures, selecting a premium seal ensures that no oil bypasses the front timing cover, preventing belt slip and expensive engine bay cleaning. Proper lubrication is key; therefore, we strongly recommend browsing our Premium Oil Filters to ensure the seal operates in a debris-free environment.
Check Engine Fitment Verification
The Theta II engine has different front seal dimensions depending on whether it is a Turbo-GDI or naturally aspirated configuration. To ensure the 21421-35520 OIL SEAL is the perfect fit for your specific crankshaft, please contact us for professional verification using your chassis number.
Note: Images shown are for illustration purposes only and may not be an exact representation of the product.
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