Your Hyundai should be filled with the transmission fluid specified for your exact model and transmission type. For most current Hyundai automatics, that means ATF SP-IV; some older models may specify Dexron VI or another fluid. Always verify with the owner's manual or a Hyundai dealer before topping up.
Understanding Hyundai transmission fluids
Hyundai uses different fluids depending on whether you have an automatic, CVT, or manual transmission. The exact specification must be followed to protect the transmission and maintain warranty coverage.
Automatic transmissions
When servicing an automatic transmission, the key is to use a fluid that meets Hyundai’s specification for your particular unit. The SP-IV specification is the current Hyundai standard for many newer transmissions, while some older applications may list Dexron VI as an acceptable substitute only if the manual explicitly allows it.
Here are the main points to check for automatic transmissions:
- Confirm the exact spec in your owner’s manual or on the transmission fill cap. Look for SP-IV (Hyundai) or Dexron VI if your manual permits Dexron VI as an alternative.
- Purchase fluids that clearly state they meet the required specification (e.g., “ATF SP-IV” or “Dexron VI as approved by Hyundai”).
- Avoid mixing fluids that do not carry the approved spec, and don’t use non-automatic-transmission gear oils or lubricants in an automatic.
- Follow the recommended service intervals from Hyundai (often around 60,000 miles under normal conditions, sooner in severe driving conditions).
Bottom line for automatic transmissions: use the exact fluid specified in your manual. If SP-IV is listed, use SP-IV; if Dexron VI is listed as acceptable, you may use Dexron VI only when explicitly approved by Hyundai for your model.
CVT transmissions
Hyundai CVT models require a dedicated CVT fluid. Do not use standard ATF in a CVT, as that can cause slipping, overheating, or failure. The exact CVT fluid specification varies by model and year, so consult the owner’s manual or a Hyundai dealer for the correct fluid (often labeled as CVTF and matched to a model-specific NS-2, NS-3, or equivalent designation).
Key considerations for CVTs:
- Only use the CVT fluid specified for your car; this is not interchangeable with standard ATF or mineral oils.
- Do not mix different CVT fluids or top off with the wrong type; changes require flushing in many cases.
- Follow Hyundai’s service intervals for CVT fluid changes, which may differ from conventional automatic transmissions.
In short, Hyundai CVTs demand their own fluid and specification. Check the manual or your dealer for the exact NS-2/NS-3 (or equivalent) designation used by your model.
Manual transmissions
Manual transmissions use gear oil rather than automatic transmission fluid. Hyundai manuals commonly require a GL-4 gear oil of the specified viscosity, with some models allowing GL-5 if the manual calls for it. Do not use ordinary ATF in a manual transmission, and avoid mixing fluids.
Guidance for manual transmissions includes:
- Identify the required viscosity and spec in the owner’s manual (e.g., 75W-90 GL-4 or equivalent).
- Use a gear oil that clearly meets the specified GL rating; many drivers choose synthetic GL-4 gear oils for better performance and longevity.
- Do not mix different gear oils or substitute ATF in a manual transmission unless the manual explicitly allows it.
Bottom line for manuals: use the gear oil and spec called out by Hyundai for your transmission type, then follow the recommended fill and change intervals.
How to find the right fluid for your Hyundai
Finding the correct fluid involves a few simple checks. Start with the owner’s manual, then corroborate with in-vehicle labels or Hyundai’s official resources. When in doubt, ask a Hyundai service advisor or your dealership for the exact specification for your VIN and model year.
What to avoid
To protect the transmission, avoid using fluids that aren’t approved for your vehicle. Mixing fluids with different specifications can compromise performance and void warranties. If you’re unsure, have a professional diagnose the system before adding or replacing fluid.
Summary
Hyundai transmissions require fluids that meet the vehicle’s exact specification. For most modern automatics, that means ATF SP-IV, with Dexron VI as an approved alternative only if your manual explicitly allows it. CVTs use a model-specific CVTF, not standard ATF, and manuals require GL-4 gear oils of the specified viscosity. Always check the owner's manual or consult a Hyundai dealer to confirm the correct fluid for your particular model and transmission type.