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Re: A new noise coming from engine compartment
I would think an engine in good repair would run fairly quietly on 15w40 ... especially in a hot climate. I have used 0w40, and 5w40 ... from time to time, in hot weather, especially on round-country trips ... in my '99 3.8. I normally use 5w30 at other times. But have had no detectable noise issues due to oil grades.
You may have some issues with your oil pump or pick-up tube. I would be tempted to drop the oil pan and have look. The oil pick up tube may be blocked ... or it may be loose at the mounting, allowing cavitation air to leak in. The oil pump and pressure relief valve are on/in the front cover.
Could the scynchronizer be noisy? May need some drops of oil.
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