Agree with all you said, Mike.

Great product to manufacture and sell if your customers can't tell what it does for them.

I suspect all car engine temps move up and down since most use the same basic kind of tstat ... most simply don't have coolant temp gages.

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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