Dave, Thanks for clarification on the piston cooling valve noise.
I have had no change in tires, nor road surface. Lately, It seems to start up after about 10-15 minutes at highway speed, I first noticed it about 3 months ago after driving for 4 hours or so and then only about 80mph, it would be cease below 70 now it kicks in at 60+ . No vibration is felt in steering wheel, noise doesn't increase or decrease in pitch with speed, just remains constant like someone blowing over the top of a soda bottle. It doesn't do it all the time, but when it does it is maddening
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