Tank size/shape is unique to our cars. E46 S54 expansion tank won’t fit. Z3 S54 expansion tank will.
They’re not excessively expensive. I plan on doing mine this summer for peace of mind, but there are no direct bolt-on aluminum replacement units on the market so I’ll be replacing with OEM.
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Sitting on a beat-up office chair in front of a 5 year old computer in a basement floor, sipping on stale coffee watching a bunch of meaningless numbers scrolling aimlessly on a dimly lit 19” monitor.
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