Approximately 4.5 quarts (4.3 liters) of engine oil, including a new oil filter.
Official capacity and what it covers
The 2021 Acura TLX with the 2.0-liter turbo engine lists an oil capacity of 4.5 quarts (4.3 liters) when performing a full oil change with a new filter. This is the figure most owners and service technicians use when planning replacements. Always verify by checking the dipstick after filling and topping off to the full mark, since some variations in oil type or climate can affect the exact amount you need.
Oil grade and specification
Use full-synthetic 0W-20 oil that meets Acura/Honda specifications. In very hot or cold climates, consult the owner's manual for any regional viscosity adjustments.
Practical considerations for changes
When performing the change yourself, drain the old oil completely, replace the filter, and add about 4.5 quarts to reach the full level. Start the engine and check for leaks, then recheck the dipstick and add small increments if necessary until the level is at the full line.
Maintenance reminders
Keep track of your oil level between changes, and adhere to the recommended service intervals—typically every 7,500 miles under normal conditions and more often in severe driving conditions. The oil capacity remains the same across this engine’s applications.
Summary
For a 2021 TLX with the 2.0L turbo, plan for about 4.5 quarts (4.3 liters) of engine oil when performing a standard change with a new filter. Use 0W-20 full synthetic and verify the level with the dipstick after refilling.