Check Latest Price. 5. Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil. If you are in the market for a top quality, full synthetic diesel engine oil for your Jeep Grand Cherokee, then you may want to consider the Shell Rotella T6. The Shell Rotella T6 is a high performance, full synthetic motor oil that provides excellent protection Installing an oil filter in a 2015 Jeep Cherokee is a simple process. Begin by raising the hood of your Jeep and opening the circular compartment on top of the engine. Once the compartment is open you must unscrew another cap to access the filter cartridge housing. Now, you can pull the old filter out and place the new one in its position. Jeep Grand Cherokee. Manufacturer: Jeep. Model: Jeep Grand Cherokee. For the 2015 model year Jeep Grand Cherokee we have found 10 trims and their corresponding recommended oil type. Click on the name of the trim to open up the panel and learn more about the oil type, volume and change period. The 3.0L V6 takes up to 5.9 quarts, the 3.6L V6 holds up to 5.9 quarts and the 5.7L V8 version comfortably holds up to 7 quarts. Jeep recommends using a fully synthetic engine oil with the 2015 Grand Cherokee, irrespective of which model You own. As for oil type, Jeep recommends using the sae 5w-20 viscosity grade oil, or the sae 5w-40. Method-1: Use the Gas Pedal. If you have a Grand Cherokee manufactured from 2009 to 2015, using the gas pedal is the quickest way to reset the oil light. And here are the steps: Step 1: For Jeep models that consist of an ignition button, keep it at the “Run” position by pressing the start button two times. ZiLnc.