Mobil 1 15-50 ... same as for last 80K on this engine and several others before ... ran great this morning ... heard it when I stopped after 80 MPH run of 60 miles ... beginning to think is hammering from IP ...

Nothing else seems to be affected ... comes and goes ... randomly, but when it is there, like this morning, "ticked" in increasing volume, but still pretty quietly for 8 seconds, then off for 3-5 then 8 etc ... I listen a lot to my equipment and this is a new sound ... just don't know if it is important, yet?

Thanks!

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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