BWM used a 2.0 bar coolant cap for years. All newer models use a 1.5 bar cap. I'm replacing mine to a 1.5 bar as soon as they are available again. Or buy a kit that as one in it. https://germanautosolutions.com/stor...r-coolant-cap/

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'06 X5 3.0i - bought @143,123 miles (12/26/20)