Chrysler never mandated that customers use any kind of special oil in their 2.7-liter V-6s, but they never publicly acknowledged their engines' inherent problems, either. If your 2.7-liter is still chugging along, you'll need to address the oiling system to keep it that way.
The 2.7-liter V-6 had very narrow oiling passages that passed perilously close to a number of engine hot-spots. This, combined with the engine's tendency to develop internal coolant leaks, made the oiling system prone to developing severe sludge problems.
The 2.7-liter's oil pressure sensor lay in a part of the system that very rarely experiences oil-restriction issues, so your engine may completely lose oil pressure while the gauge reads "Normal."
Flush your oiling system and change the oil every 1000 miles for three to five cycles, or until the oil comes out clear, thin and free of sludge. You can use a cheap conventional 10W oil for the flushing procedure; after the last flushing, you should switch to a high-quality 5W-30 full synthetic high "high mileage" seal conditioners. While it is two to three times more expensive than a conventional oil, the full synthetic should last three to four times longer and keep your engine free of sludge.
