* Viscosity: A heavier viscosity is generally recommended for towing, especially in hotter climates. Look for something in the range of 5W-30 or 10W-30. In very hot climates, 10W-40 might be considered, but always check your owner's manual first. Using a viscosity *too* high can cause issues with engine start-up in cold weather, while using one *too* low won't offer sufficient protection under heavy load.
* Type: Use a synthetic blend or full synthetic oil. These offer superior high-temperature protection and longevity compared to conventional oils. The added protection is crucial when towing, as the engine works harder and generates more heat.
* Specifications: Ensure the oil meets or exceeds the specifications recommended in your Jeep's owner's manual. This will often include API certifications (like SM, SN, or SP – check your manual for the latest recommendation) and possibly Jeep-specific requirements.
* Consider a high-mileage oil: If your Jeep has high mileage, a high-mileage oil might be beneficial. These oils often contain additives designed to help address wear and tear in older engines.
In summary: For a 2000 Jeep Grand Cherokee that tows heavily, a full synthetic 5W-30 or 10W-30 oil meeting or exceeding the specifications listed in your owner's manual is the best choice. If it’s very hot where you live, a 10W-40 might be acceptable, but again, *consult your owner’s manual first*. A high-mileage synthetic blend would also be a good option for a high-mileage vehicle.
Before making any changes, always consult your Jeep Grand Cherokee's owner's manual for the manufacturer's specific oil recommendations. Ignoring these recommendations can void your warranty (if applicable) and potentially damage your engine.
