Five quarts of motor oil with a new filter is the typical capacity for the 2009 Impala’s 3.5 L V6. Always confirm the level with the dipstick after adding oil.
Understanding the specification
The 3.5 L V6 used in the 2009 Impala (engine code LY7) is listed by GM as having an oil capacity of about five quarts when an oil change includes a new filter. This figure is commonly cited in owner and service manuals. If you drain and fill without changing the filter, the amount you pour in will be slightly less, typically around 4.5–4.8 quarts before topping to full.
Oil type and how to fill
GM typically recommends 5W-30 oil for this engine, with a preference for a full-synthetic or synthetic-blend depending on climate and driving conditions. Check the owner's manual or the oil cap for exact specification. After replacing the oil and filter, start the engine, run briefly, then recheck the level and top off as needed to reach the full mark.
Step-by-step brief for changing oil
If you are performing the change yourself: gather supplies, drain old oil, remove and replace the filter, pour in roughly 4.5–5 quarts, run the engine to circulate oil, recheck the dipstick, and add as necessary to reach the full mark.
Conclusion
For a 2009 Chevy Impala with a 3.5 L V6, plan for about five quarts of oil each time you change the oil with a new filter. Always verify the exact level with the dipstick as part of the standard maintenance routine.
Summary
Oil capacity for the 2009 Impala 3.5 L is about five quarts with filter; confirm level with the dipstick after filling.