I have been using duracool in my 79 280CE. Its very coold when it like 85 degrees, but when its near 95 its OK at idle(60-65 degree), when driving its about 55 degrees. It keeps me from sweating, but it doesn't freeze me out.

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg