Normal running at 90C is likely not normal ... it is very interesting that some folks report running at 95C with peaks to 105-110C, but don't fix their engines ... this appears to be abnormally high relative to most folks that report running 80-85C almost all the time (normal ops).

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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