Understanding the 2018 Grand Cherokee oil type is essential for maintaining the peak performance and longevity of this iconic luxury SUV. The 5.7-liter HEMI V8, the most common engine for this model year, relies on specific oil specifications to ensure optimal lubrication and efficiency. Using the correct viscosity and meeting the required standards is not just a recommendation; it is a critical factor in preserving the sophisticated engineering that defines the Jeep Grand Cherokee.
Recommended Oil Specifications for 2018 Models
For the majority of 2018 Grand Cherokees equipped with the standard 3.6L Pentastar V6 or the 5.7L HEMI V8, the factory fill requires 5W-20 synthetic oil. This specific viscosity is engineered to provide the necessary protection during cold starts while maintaining stability at high operating temperatures. It is crucial to verify this requirement, as models with the SRT8 performance variant or the diesel option have different needs that must be addressed separately to prevent potential damage.
API Standards and Additives
Alongside the correct viscosity, the oil must meet specific API service standards to ensure compatibility with the vehicle's emissions systems and engine internals. Look for oil that meets the API SP rating, which offers improved protection against oxidation and low-speed pre-ignition. The inclusion of the ILSAC GF-6 standard further guarantees that the detergent package is modern and effective at keeping the HEMI's intricate valvetrain clean under demanding conditions.
The Importance of the Oil Filter Selecting the right oil is only half of the maintenance equation; the oil filter plays an equally vital role in the 2018 Grand Cherokee's health. A high-efficiency filter with a robust anti-drain-back valve ensures that the engine is protected the moment the key is turned. Jeep recommends using a genuine Mopar filter or an equivalent that meets OE specifications to guarantee proper fitment and filtration without restricting oil flow. Performance and Synthetic Blend Considerations
Selecting the right oil is only half of the maintenance equation; the oil filter plays an equally vital role in the 2018 Grand Cherokee's health. A high-efficiency filter with a robust anti-drain-back valve ensures that the engine is protected the moment the key is turned. Jeep recommends using a genuine Mopar filter or an equivalent that meets OE specifications to guarantee proper fitment and filtration without restricting oil flow.
While conventional oil might be cheaper, investing in a full synthetic blend is highly recommended for the 2018 Grand Cherokee. The HEMI engine operates at high temperatures and benefits from the consistent viscosity that synthetics provide, especially in varying climates. This choice enhances fuel economy, offers superior protection during towing, and extends the interval between oil changes, making it a cost-effective decision in the long term.
Consequences of Incorrect Oil Usage
Deviating from the recommended 5W-20 viscosity can lead to significant mechanical issues over time. Using a thicker oil can cause increased engine drag, resulting in reduced fuel economy and sluggish performance. Conversely, using a viscosity that is too thin may not provide adequate lubrication, leading to increased wear on critical components like the camshaft and lifters, potentially voiding the vehicle's warranty.
