The 2005 Acura TSX generally requires 5W-30 engine oil, with a total capacity of about 4.5 quarts including the filter. You may use either conventional or full synthetic oil, as long as it meets Acura’s specifications and current API/ILSAC standards.
Here’s a detailed look at the recommended viscosity, acceptable alternatives, and practical maintenance considerations to keep the K24A2 engine running smoothly in this model year.
Recommended oil types and viscosity
Before listing the options, note that the 2005 TSX is designed to use a 5W-30 viscosity in most climates. Any oil that meets the API SN (or newer) standard and ILSAC GF-5 (or newer) specification is acceptable, whether conventional or synthetic. The key is to choose an oil that meets these standards and fits your climate and driving conditions.
- 5W-30: Primary recommendation for most environments. Can be conventional or synthetic, as long as it meets API SN (or newer) and ILSAC GF-5 (or newer) specs.
- 0W-30 or 0W-20: Acceptable only if explicitly specified by Honda/Acura for this exact model/year and climate; not the standard recommendation for the 2005 TSX.
- 5W-20: Not typically recommended for this year and model unless the owner’s manual or a dealer specifies; otherwise, avoid for routine changes.
Adhering to the manual or speaking with a dealer ensures you choose the right viscosity for your location and seasonal conditions.
Oil capacity and change interval
The engine’s oil capacity, including the filter, is about 4.5 quarts (roughly 4.3 liters). After an oil change, verify the level on the dipstick once the oil settles. Typical change intervals vary by oil type and driving conditions: about 5,000 miles with conventional oil and around 7,500–10,000 miles with synthetic, or as dictated by Honda’s maintenance minder for this vehicle.
In regions with extreme temperatures or demanding driving, consider following the maintenance minder guidance or consulting a dealer to establish a schedule that preserves engine longevity.
Bottom line
For a 2005 Acura TSX, use 5W-30 oil that meets API SN or newer and ILSAC GF-5 or newer, with a fill of about 4.5 quarts including the filter. Both conventional and synthetic formulations are acceptable; always follow the owner’s manual or a dealership’s guidance for climate-specific recommendations and maintenance intervals.
Summary
Key takeaways: The 2005 TSX uses 5W-30 engine oil, about 4.5 quarts with filter. Oil can be conventional or synthetic, provided it meets API SN and ILSAC GF-5 standards. Follow the owner’s manual for precise interval guidance, and adjust based on climate and driving conditions.