Hello everyone. Just to update you, I dumped the mobil one out last night, and put in the castrol GTX 20-50. Within about 15 miles, the noise is gone.
I am dumbfounded why it did this, but wont make the mistake of using synthetic oil in an older motor again.
Ed, I agree the noise is ambarassing, even though perhaps it offers better protection. Perhaps one of the lifters is going bad, and the increased flow of the mobil 1 exploited it. Just a thought.
Thanks to all...
93 300D 2.5 Turbo, Black/Palomino 273K
09 E350 Black/Black 41K