* High Mileage Specific Oil: Look for motor oil specifically formulated for high-mileage engines. These oils often contain additives designed to help reduce leaks, improve seal elasticity, and clean accumulated sludge and deposits. Many brands offer these, such as Valvoline MaxLife, Castrol GTX Magnatec, and Pennzoil Platinum High Mileage.
* Viscosity: Consult your owner's manual for the recommended viscosity grade. This is usually something like 5W-30 or 10W-30, but older Cherokees might recommend something different. For high mileage, a slightly higher viscosity (like 10W-40) might be beneficial in warmer climates to help reduce leaks, but *only if your owner's manual allows it*. Using the wrong viscosity can damage your engine.
* Synthetic Blend or Full Synthetic: Synthetic blend oils are a good compromise between price and performance. They offer better protection than conventional oils, particularly in high-mileage engines. Full synthetic oils provide the best protection and longevity but are more expensive.
* API Certification: Check for the API certification (e.g., SN, SN Plus, SP) on the oil bottle. This ensures it meets industry standards for performance and protection.
In short: Start by checking your owner's manual for the recommended viscosity and oil specifications. Then, look for a high-mileage specific oil with the appropriate viscosity and API certification. A synthetic blend is a good option for many high-mileage vehicles.
Before making a decision, I strongly advise checking your Jeep Cherokee's owner's manual. It will contain the manufacturer's recommendations for oil type and viscosity, which are crucial for the longevity and proper functioning of your engine. Ignoring this information can lead to serious engine damage.
