The 2009 Honda Odyssey typically uses 5W-20 motor oil that meets API SN or newer and ILSAC GF-5 or newer, with a capacity of about 4.5 quarts including the filter. Conventional, synthetic-blend, or full synthetic oils that meet the spec are acceptable; always check the owner's manual for climate-specific guidance.
Oil type and viscosity
The 3.5-liter V6 in the 2009 Odyssey is designed to operate with 5W-20 oil under normal conditions. Use an oil that meets API service category SN or newer and ILSAC GF-5 or newer. You may choose conventional, synthetic-blend, or full synthetic oil, so long as it meets the specification. Using a viscosity outside the recommended range can affect lubrication, fuel economy, and engine wear, especially in extreme temperatures.
Oil capacity and change intervals
The engine oil capacity for a full change (oil plus filter) is roughly 4.5 quarts. Change intervals vary by oil type and driving conditions: conventional oil typically requires a change around 3,750–5,000 miles, while synthetic oils can extend to about 7,500 miles under normal service. In severe service conditions (towing, short trips, extreme heat or cold), more frequent changes may be advised. Always install a new oil filter with every change.
Choosing the right oil and where to buy
Look for oil labeled with API SN or newer and ILSAC GF-5 or newer. Honda Genuine oil is an option, as are reputable third-party brands such as Mobil 1, Castrol, Pennzoil, and Valvoline, provided the product meets the required specifications. If in doubt, consult the owner's manual or a certified technician.
Summary
For a 2009 Honda Odyssey, use 5W-20 motor oil that meets API SN or newer and ILSAC GF-5 or newer, with an approximate capacity of 4.5 quarts (including the filter). You may use conventional, synthetic-blend, or full synthetic oil as long as it meets the spec. Always follow the maintenance guidance in the owner's manual for climate-related adjustments and service intervals.