The 2021 Honda Accord with the 1.5-liter turbo engine uses about 3.7 quarts of engine oil when replacing the oil filter, and roughly 3.0 quarts if the filter is not replaced. The recommended lubricant is 0W-20 full synthetic.
Official capacity and oil type
Honda's owner’s manual for the 2021 Accord with the 1.5-liter turbo (L15B7) lists an oil capacity of 3.7 quarts (3.5 liters) with the filter installed. This figure refers to a standard oil change using a new filter. The factory-recommended viscosity is 0W-20, and Honda specifies full-synthetic oil for optimal performance and protection.
Practical considerations for maintenance
In practice, technicians top off to the correct level after replacing the filter, which typically brings the total to about 3.7 quarts. If the filter is not replaced, the system will hold roughly 3.0 quarts, but you should verify the level with the dipstick after filling and adjust as needed to reach the full operating range.
Summary
For a 2021 Honda Accord equipped with the 1.5-liter turbo engine, plan on about 3.7 quarts of oil with a new filter, using 0W-20 full synthetic oil. Always confirm with the owner's manual and check the dipstick to ensure the level is within specification after an oil change.