Yes, there is just no reason to keep losing any regularly if some way to catch and reuse ( draw back in when cool ) is available...it was a great improvement....and provides instant always there reserve.... and with semi transparent ones you can monitor the coolant level without having to take off the ( HOT ) cap. I am a big fan of them as you might can tell and am planning on putting one onto my 1980 240d. I plan on making a tool holding tray on top of it just for grins.
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