The 2018 Dodge Durango R/T requires SAE 5W-20 full synthetic engine oil meeting FCA Material Standard MS-6395 and carrying the American Petroleum Institute (API) Certified Starburst certification. For the 5.7-liter HEMI V8 engine that powers this performance SUV, the total oil capacity is 7 quarts (6.6 liters) when replacing the oil and the oil filter.
Maintaining the proper fluid specifications for your vehicle ensures longevity, prevents internal mechanical wear, and protects the variable valve timing (VVT) and Multi-Displacement System (MDS) lifters. Because performance engines operate under high thermal and mechanical loads, choosing the correct viscosity and certification standard is critical for preventing sludge buildup and maintaining optimal oil pressure across all operating temperatures.
Understanding the 5.7L HEMI V8 Powerplant in the 2018 Durango R/T
The 2018 Dodge Durango R/T features a robust 5.7-liter HEMI V8 engine rated at 360 horsepower and 390 lb-ft of torque. Unlike the standard V6 Pentastar engine options available in lower trims, the R/T's high-output V8 incorporates advanced technologies like Fuel Saver Technology (MDS), which deactivates four cylinders during cruising conditions to maximize fuel efficiency.
These sophisticated systems rely heavily on precise hydraulic pressure and consistent fluid viscosity. If the wrong oil weight is utilized, the MDS solenoids and lifters may experience sluggish response times, leading to rough transitions, diagnostic trouble codes (DTCs), or potential internal damage over extended use.
Why Material Standard MS-6395 Matters
Fiat Chrysler Automobiles (FCA), now part of Stellantis, developed the MS-6395 material standard to ensure that aftermarket and factory lubricants meet specific wear, deposit, and emissions requirements tailored to their engine metallurgy. When selecting an oil for the 2018 Dodge Durango R/T, verify that the back of the bottle explicitly lists compliance with FCA MS-6395 alongside the API certification mark. Failing to use an oil that meets this standard can theoretically complicate warranty claims if engine-related lubricated components fail prematurely.
Detailed Oil Specifications and Viscosity Breakdown
While SAE 5W-20 is the factory-recommended viscosity for standard operating conditions in North America, understanding how oil viscosity behaves across different ambient temperatures helps owners make informed maintenance decisions.
Viscosity Grades and Temperature Ranges
- SAE 5W-20: Recommended for all ambient temperatures, providing optimal cold-start flow and stable high-temperature protection.
- Alternative Viscosities: While 5W-20 is standard, the owner's manual for FCA vehicles traditionally notes that if 5W-20 is unavailable, oils with alternative weights should only be used temporarily until the correct specification can be restored, provided they carry the proper API certification and MS-6395 approval. However, sticking strictly to 5W-20 is strongly advised for daily driving and optimal fuel economy.
Synthetic vs. Conventional Oil
The 2018 Dodge Durango R/T 5.7L HEMI engine requires full synthetic oil. Synthetic oils possess uniform molecular structures that resist thermal breakdown far better than conventional mineral oils. In high-performance applications like the Durango R/T, synthetic formulas maintain their lubricating film strength under heavy acceleration, towing, and sustained highway speeds, reducing varnish formation on critical components like camshafts and timing chains.
| Engine Type | Recommended Viscosity | Required Specification | Total Oil Capacity | Oil Filter Type |
|---|---|---|---|---|
| 5.7L HEMI V8 | SAE 5W-20 | FCA MS-6395, API Certified | 7.0 Quarts (6.6 Liters) | Cartridge Style (e.g., Mopar MO-349 or equivalent) |
Oil Capacity and Fill Procedures
Filling the 5.7L HEMI V8 correctly requires attention to detail. Buying an exact quantity can sometimes lead to underfilling or overfilling if the filter volume is not accounted for during the refill process.
Total Capacity vs. Refill Capacity
The total capacity for a dry engine build is slightly higher, but during a standard oil and filter change, the system takes 7 quarts.
- Drain the Old Fluid: Ensure the vehicle is safely raised on jack stands or a lift, remove the underbody splash shield if necessary, and completely drain the oil pan while the engine is warm.
- Replace the Filter: The 2018 Durango R/T uses an accessible cartridge-style oil filter housed in a plastic cap assembly located on top of the engine near the front. Replace the O-ring seal on the cap and torque it to the manufacturer's specification (usually printed directly on the housing cap).
- Initial Fill: Add 6.5 quarts of fresh SAE 5W-20 synthetic oil through the valve cover oil cap.
- Verify Level: Start the engine to fill the oil filter gallery, let it idle for 30 seconds, shut it down, wait a few minutes for the oil to settle back into the pan, and check the dipstick. Add the remaining half-quart incrementally until the fluid level reaches the full mark on the dipstick. Avoid overfilling, as excess oil can cause aeration, foaming, and increased crankcase pressure.
Recommended Oil Change Intervals
Adhering to a strict oil change interval safeguards the 5.7L HEMI V8 against premature wear. Modern vehicles are equipped with an Oil Life Monitor (OLM) system that calculates remaining oil life based on engine operating hours, ambient temperatures, trip lengths, and driving habits.
Standard vs. Severe Driving Conditions
- Normal Driving Conditions: Under typical highway commuting and moderate climate conditions, the intelligent oil life system may indicate intervals up to 10,000 miles or 12 months, whichever comes first.
- Severe Driving Conditions: If your driving habits involve frequent short trips (under 10 miles), extensive idling, heavy towing, hauling, or driving in dusty or extremely cold environments, it is best practice to shorten the interval to every 5,000 to 7,500 miles or 6 months. Short trip cycles prevent the engine oil from reaching temperatures high enough to boil off accumulated moisture and fuel dilution, accelerating oil degradation.
Frequently Asked Questions
Can I use 5W-30 oil in my 2018 Dodge Durango R/T?
While using 5W-30 in an emergency will not immediately destroy the engine, it is not recommended for regular use. The tighter tolerances and precise hydraulic requirements of the VVT and MDS systems are engineered around 5W-20. Sticking to the factory specification ensures proper hydraulic actuation and maximum fuel efficiency.
How many quarts of oil does a 2018 Dodge Durango R/T take?
The 5.7-liter HEMI V8 engine in the 2018 Durango R/T takes exactly 7 quarts (6.6 liters) of oil when changing both the engine oil and the oil filter simultaneously. Always verify the level using the dipstick rather than relying solely on the bottle count.
What oil filter does the 2018 Durango R/T use?
The 2018 Dodge Durango R/T with the 5.7L engine uses a cartridge-style filter rather than a traditional spin-on metal canister. The original equipment manufacturer (OEM) part is typically a Mopar MO-349, though high-quality equivalent aftermarket filters matching this specification are widely available.
Do I really need full synthetic oil for this vehicle?
Yes. Full synthetic oil is strongly recommended, and many industry standards for modern performance V8 engines mandate it. Synthetic oils resist thermal breakdown under aggressive driving conditions, reduce engine deposits, and provide superior cold-weather flow compared to conventional petroleum oils.
How do I reset the oil life light on a 2018 Dodge Durango?
To reset the oil change indicator after performing maintenance, turn the ignition switch to the "ON" position without starting the engine. Fully depress the accelerator pedal slowly three times within 10 seconds. Turn the ignition back to the "OFF" position, then start the vehicle to confirm the message has cleared.
Conclusion and Maintenance Best Practices
Selecting the correct 2018 dodge durango r t oil type—specifically an SAE 5W-20 full synthetic oil meeting FCA MS-6395—alongside a precise 7-quart capacity fill, ensures your 5.7L HEMI V8 delivers peak performance and reliable service life. Always combine routine fluid changes with regular inspections of your oil filter housing seals, air filters, and fluid levels. Maintaining a meticulous maintenance log will protect your investment and keep your performance SUV running smoothly for years to come.
