The 2018 Grand Cherokee oil capacity and type are essential details for any owner looking to maintain their vehicle’s performance and longevity. Understanding these specifications is not merely a recommendation; it’s a fundamental aspect of proper vehicle care, directly impacting engine health, fuel efficiency, and the overall driving experience. Incorrect oil, whether in type or quantity, can lead to premature wear, reduced performance, and potentially costly repairs. This comprehensive guide will walk you through everything you need to know about the oil requirements for your 2018 Jeep Grand Cherokee.
Identifying Your 2018 Grand Cherokee Engine
Before diving into specific oil capacities and types, it’s crucial to identify which engine powers your 2018 Grand Cherokee. Jeep offered a range of robust engines for this model year, and each has distinct lubrication requirements. The primary engines found in North American models include:
3.6L Pentastar V6: A popular and versatile engine known for its balance of power and efficiency.
5.7L HEMI V8: Offering more power and torque, typical in higher trim levels.
6.4L SRT HEMI V8: Found in the high-performance SRT model, designed for exhilarating power.
6.2L Supercharged HEMI V8: Exclusive to the ultra-high-performance Trackhawk model, this engine demands specific attention.
You can usually find your engine type listed on your vehicle’s window sticker, owner’s manual, or by checking the VIN.
2018 Grand Cherokee Oil Capacity by Engine Type
Getting the oil capacity right is just as important as using the correct oil type. Too little oil can lead to inadequate lubrication and overheating, while too much can cause aeration, pressure issues, and potential seal damage. Always aim for the “full” mark on your dipstick after an oil change, but avoid overfilling.
Here are the typical oil capacities for the 2018 Grand Cherokee’s various engines (including filter change):
3.6L Pentastar V6: Approximately 6 US Quarts (5.7 Liters).
5.7L HEMI V8: Approximately 7 US Quarts (6.6 Liters).
6.4L SRT HEMI V8: Approximately 7 US Quarts (6.6 Liters).
6.2L Supercharged HEMI V8 (Trackhawk): Approximately 7 US Quarts (6.6 Liters).
It’s always a good practice to add slightly less than the full capacity, then check the dipstick, adding small amounts until the oil level reaches the “full” line. This helps prevent accidental overfilling.
Selecting the Right Oil Type for Your 2018 Grand Cherokee
Beyond capacity, the type of engine oil—specifically its viscosity grade and certification—is paramount. Modern engines, like those in the 2018 Grand Cherokee, are engineered with tight tolerances that require specific oil properties to function correctly.
Here’s a breakdown of the recommended oil types:
For 3.6L Pentastar V6 and 5.7L HEMI V8:
Viscosity Grade: SAE 5W-20.
Certification: You must use a high-quality full synthetic engine oil that meets Chrysler Material Standard MS-6395. This specification ensures the oil has the necessary additives and detergents to protect these engines effectively.
Recommendation: While a synthetic blend might seem like an option, full synthetic is highly recommended by Jeep for optimal performance, wear protection, and extended oil change intervals.
For 6.4L SRT HEMI V8 and 6.2L Supercharged HEMI V8 (Trackhawk):
Viscosity Grade: SAE 0W-40.
Certification: These high-performance engines require full synthetic oil meeting Chrysler Material Standard MS-12633. This is a more stringent specification designed for the extreme demands of these powerful engines.
Recommendation: For these engines, using anything less than a full synthetic 0W-40 meeting the MS-12633 standard is not advised and could void warranties or lead to significant engine damage.
Understanding Viscosity Grades (e.g., 5W-20, 0W-40):
The “W” in the viscosity grade stands for “winter,” indicating the oil’s performance in cold temperatures. The number before the W (e.g., 5W) represents its flowability at low temperatures, while the second number (e.g., -20 or -40) indicates its thickness at operating temperature. Using the manufacturer-specified grade ensures proper lubrication from startup in cold weather to high-temperature operation.
The Importance of Manufacturer Specifications (MS-6395, MS-12633):
These material standards are critical. They signify that the oil has undergone rigorous testing by Chrysler/Jeep and meets specific performance criteria beyond just the API (American Petroleum Institute) or ILSAC (International Lubricant Specification Advisory Committee) standards. Always look for these specific “MS” numbers on the oil bottle when purchasing.
The Role of Regular Oil Changes and Filters
Even with the correct oil type and capacity, regular oil changes are fundamental. Over time, engine oil breaks down, loses its lubricating properties, and becomes contaminated with combustion byproducts and debris.
Oil Change Intervals: For most 2018 Grand Cherokees using the recommended full synthetic oil, the general guideline is to change the oil and filter every 10,000 miles (16,000 km) or 12 months, whichever comes first. However, if you frequently drive under severe conditions (e.g., heavy towing, extreme temperatures, dusty environments, extensive stop-and-go city driving), consult your owner’s manual; you might need more frequent changes.
Oil Filter: Always replace the oil filter with a new, high-quality filter designed for your specific Grand Cherokee engine during every oil change. The filter traps contaminants and prevents them from recirculating through your engine.
Neglecting regular oil changes can lead to:
Sludge Buildup: Impaired lubrication and heat dissipation.
Increased Friction and Wear: Shortening engine life.
Reduced Fuel Efficiency: The engine has to work harder.
Potential Engine Failure: In severe cases, leading to complete engine seizure.
Tips for Optimal Engine Health
To ensure your 2018 Grand Cherokee’s engine continues to perform reliably for years to come:
Check Oil Levels Regularly: Even between changes, occasionally check your oil level on a flat surface when the engine is warm (but has been off for a few minutes).
Heed Dashboard Warnings: If your oil pressure light or check engine light illuminates, address it immediately.
Use Quality Parts: Stick to OEM (Original Equipment Manufacturer) oil filters or high-quality aftermarket equivalents recommended for your vehicle.
Keep Records: Maintain a log of your oil changes, including dates, mileage, and the type of oil used. This is invaluable for warranty purposes and tracking maintenance.
By adhering to the specific 2018 Grand Cherokee oil capacity and type recommendations outlined above, you are taking a crucial step in safeguarding your investment and ensuring a smooth, powerful ride for many miles to come.
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Source: Jeep Grand Cherokee Owner’s Manual and Manufacturer Specifications.