The quick answer: use a synthetic oil that meets Dexos1 Gen2, most commonly 0W-20, for the 3.6L V6 in the 2018 Impala. If 0W-20 isn’t available, Dexos1 Gen2 5W-30 is an acceptable alternative. Always verify with the owner’s manual or the under-hood label.
In more detail, GM specifies Dexos1 Gen2 synthetic oils for the 3.6L V6 in the 2018 Impala. The exact viscosity can vary by climate and region, but 0W-20 is typically the default for fuel economy and cold-start performance, while 5W-30 may be used where 0W-20 is not stocked or in hotter climates. Always follow the vehicle’s manual and the oil cap label to ensure you meet the specification.
Oil specifications and recommended viscosities
These options meet Dexos1 Gen2 requirements for the 2018 Impala V6. Use the first option as your default whenever possible.
- Dexos1 Gen2 approved synthetic oil with 0W-20 viscosity
- Dexos1 Gen2 approved synthetic oil with 5W-30 viscosity (acceptable if 0W-20 is unavailable or for specific regional climate needs)
In practice, 0W-20 Dexos1 Gen2 is typically the preferred choice for the 2018 Impala V6, offering good cold-start performance and fuel efficiency; 5W-30 Dexos1 Gen2 remains an acceptable alternative when 0W-20 is not accessible.
Where to find and verify the correct specification
Check the owner's manual for the official specification, and look at the under-hood oil cap or the vehicle’s information label for Dexos1 Gen2 and viscosity guidance. Your GM dealer can also confirm the right viscosity for your specific vehicle and market.
Before performing an oil change, ensure you have the correct oil viscosity and specification. Using the wrong oil can affect engine wear and warranty coverage.
How to check oil level and plan changes
Follow these steps to check your oil level and prepare for changes. Regular checks help you catch leaks or low oil before they cause engine damage.
- Park on level ground and turn off the engine; wait a few minutes for the oil to settle.
- Open the hood and locate the dipstick labeled for engine oil.
- Pull the dipstick, wipe it clean, reinsert fully, then remove to check the oil level. The dipstick should show between "MIN" and "MAX" marks.
- If low, add the recommended Dexos1 Gen2 oil in small increments, rechecking the level after each addition.
- Change the oil and filter at the interval recommended by GM in your manual, using the correct Dexos1 Gen2 oil.
Maintaining the proper oil specification is essential for performance and warranty compliance. If you’re unsure, consult a certified GM technician.
Summary
The 2018 Chevy Impala V6 uses Dexos1 Gen2 synthetic oil, with 0W-20 as the typical default viscosity; 5W-30 is an acceptable alternative where 0W-20 is unavailable. Always verify with the owner's manual or under-hood label, and use the correct viscosity and Dexos1 Gen2 specification for optimal engine protection.
How many quarts of oil does a 2018 Chevy Impala 3.6 L take?
5 to 6 quarts
The 3.6L V6 engine in the 2018 Chevrolet Impala typically requires around 5 to 6 quarts of oil, depending on drain and filter specifics — our team checks and refills to the exact factory recommendation.
Ask about result
What oil does a V6 Chevy Impala take?
Valvoline – High Mileage 5W-30 Full Synthetic Engine Oil, Prevents Leaks (Part No. 881169)
Ask about result
How much oil does a 3.5 V6 Chevy Impala take?
about 5 quarts
The 3.5L V6 normally requires about 5 quarts (roughly 4.7 liters) with a filter change; our technicians top and verify levels to factory specs. Proper fill is critical—overfilling or underfilling affects performance and can cause engine issues.
Ask about result
What type of oil does a 3.6 L V6 take?
3.6L V6: SAE 0W-20 Full Synthetic (API Starburst) — 5 quarts with filter.
Ask about result