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Old 12-10-2011, 08:38 PM   #15
1st Gear Newbie
Join Date: Aug 2007
Location: In my car
Posts: 34
The date of manufacturer is on the left or right tank of the rad. (If you want to know)

It is a good idea to change the rad & expansion tank every 5 years. If the car slightly overheats, it warps the head, and pulls our the cylinder head bolts.

E39 are like Princesses, they demand a lot and don't take well to getting old.
My cooling system is 4 years old, and will be replaced next year...
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