A couple of the nearby BMW dealers sell a gallon of coolant concentrate for about $25. Total cost with sales tax and a gallon of distilled water is $30 or less, or about $15 per gallon ... basically same cost as the aftermarket coolants.
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20mm OD x 12mm ID x 4mm W : Viton O-Ring
3/4" OD x 1/2"ID x 1/16" Thick : Thrust Bearing/Washer