Thanks, RWT,

I don't know how the engine "knows," but was following up on a comment made by OldSouth in this thread.

Idea on plating off the EGR is a great one ... would allow the valve to continue to work and would not "show" any modifications while still keeping the heat out of the intake, thereby preventing coking of the oil fumes.

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George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg