if you have the 3.1 liter engine than don't waste your money on synthetic. There are several known mechanical issues with that motor that synthetic will not help with. It will last just as long on conventional oil.
If you live in a part of the world that sees snow than synthetic will help with cold weather start ups.
If you have any oil leaks synthetic could make the leak worse or it could make it better.
Synthetic is of course more expensive. It does not mean you can run longer intervals between oil changes. If the engine is tight and efficient and extended service interval with synthetic oil is a possibility. If the engine has higher miles, starting to show signs of wear and is no longer as efficient or tight as it once was than extended services are not an option and may do more harm than good.
Interstate batteries are one of the best. Exide and NAPA brands would be the next on my list. Stay away from brands like energizer, werker, batteries plus.
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