What oil is recommended for a 2018 6.6 Duramax?
The 2018 6.6L Duramax diesel engine is a powerhouse known for its reliability and performance, especially in heavy-duty trucks like the Chevrolet Silverado and GMC Sierra HD models. To keep this engine running smoothly and efficiently, using the correct oil is crucial. In this article, we’ll explore the recommended oil type, viscosity, and other considerations for maintaining your Duramax engine.
Recommended Oil Type and Viscosity
For the 2018 6.6L Duramax engine, General Motors recommends using full synthetic diesel engine oil that meets the dexos2™ specification. This ensures optimal performance, protection, and fuel efficiency. The recommended viscosity grade is 15W-40 for normal operating conditions. However, in colder climates where temperatures drop below 0°F (-18°C), a 5W-40 synthetic oil is advised to ensure proper cold-start performance.
Why Use dexos2™-Approved Oil?
The dexos2™ specification is designed to meet the unique demands of modern diesel engines, including:
- Improved engine cleanliness and reduced sludge buildup.
- Enhanced protection against wear and tear, especially under heavy loads.
- Better fuel efficiency and reduced emissions.
- Compatibility with diesel particulate filters (DPFs) and other emissions systems.
Using oil that meets this specification ensures your engine remains in peak condition and complies with manufacturer requirements, which is especially important for warranty coverage.
How Often Should You Change the Oil?
The oil change interval for a 2018 6.6L Duramax depends on your driving habits and conditions. Under normal driving conditions, it is recommended to change the oil every 7,500 miles or as indicated by the Oil Life Monitoring System in your vehicle. For severe driving conditions, such as frequent towing, idling, or driving in extreme temperatures, consider changing the oil every 5,000 miles.
Steps to Change the Oil in a 6.6L Duramax
If you’re a DIY enthusiast, here’s a quick guide to changing the oil in your Duramax engine:
- Ensure the engine is warm but not hot to the touch.
- Place a drain pan under the oil drain plug and remove the plug to drain the old oil.
- Remove the old oil filter and replace it with a new one, ensuring the gasket is properly seated.
- Reinstall the drain plug and tighten it to the manufacturer’s torque specification.
- Fill the engine with the recommended amount of fresh oil (approximately 10 quarts for the 6.6L Duramax).
- Start the engine and let it run for a few minutes, then check for leaks.
- Turn off the engine and check the oil level, adding more if necessary.
Changing your oil regularly is one of the simplest yet most effective ways to extend the life of your Duramax engine.
Conclusion
Using the correct oil for your 2018 6.6L Duramax is essential for maintaining its performance and longevity. Always opt for a full synthetic oil that meets the dexos2™ specification, and follow the recommended viscosity and oil change intervals. If you’re unsure or need assistance, don’t hesitate to visit a trusted auto repair shop like Kevin’s Autos for professional service. Proper maintenance today can save you from costly repairs down the road!
Frequently Asked Questions
What happens if I use 20w50 instead of 15w40?
What is the difference between putting in 15w40 and 20w50 oil? From the viewpoint of behavior when cold, oils with a lower SAE before the W will behave better at low temperatures. In other words, a lubricant with SAE 15W-40 will behave better when cold than a lubricant with SAE 20W-50.
How many miles is Duramax full synthetic oil good for?
If your vehicle's manufacturer recommends a mileage interval greater than 7500 miles, you will need to change your vehicle's motor oil using DuraMAX synthetic motor oil at least one time per year and as often as recommended by the vehicle manufacturer (or before every 10,000 miles, whichever occurs first).
What oil does the 2024 6.6 Duramax take?
Factory fill is Delvac 15W40.
What kind of oil does a 2018 6.6 Duramax take?
15W-40 (Above -18°C) - SAE 15W-40 is preferred. Capacity: 10 quarts (with filter). After refill check oil level.
What is Duramax full synthetic oil?
DuraMAX® SYNTHETIC MOTORS OILS are full synthetic passenger car and light-duty truck engine oils formulated with premium synthetic base oils and next generation performance additives designed to improve fuel economy, control sludge and oxidation, and inhibit Low Speed Pre Ignition (LSPI).
Which is better, 5W40 or 15w40?
Both will have a viscosity of a 40 grade. That cannot be said for both oils during the dead of winter. The 5w-40 will have a lower viscosity when the engine is started than the 15w-40; consequently the 5w-40 will start easier and lubricate quicker in the cold than the 15w-40.
How often do you change oil in a 6.6 Duramax diesel?
10,000 miles
Duramax 6.6-Liter Maintenance Schedule
Oil and filter change at 10,000 miles or when you see the “Change engine oil” message.
Can you use 5w40 instead of 15W40 Duramax?
As a result, they are much less prone to being too thick in the extreme cold or thinning out in extreme heat. Therefore, a good 5W-40 will provide flawless protection all year-round. That is why a 5W-40 can now safely replace 15W-40 for year-round use.
What brand oil does GM use in Duramax?
XLT Euro Advanced Synthetic Motor Oil.
What synthetic oil does GM recommend?
dexos®1 Gen 2 | GM.
