From reading what goes wrong with BMWs, one scary well known flaw is the lousy leaking plastic radiators.
Since BMW apparently puts 30psi pressure caps (marked 200, or 2 Bar) on these plastic radiators, I wonder if simply changing the pressure cap to something more akin to what the US manufacturers use (I think that's 14psi, right?) might work.
The boiling point tradeoffs may or may not be worth it, so that's why I ask.
It seems, almost every BMW eventually (generally by 100k miles) cracks at the badly designed joint where the upper and lower radiator hose connects to the plastic radiator section.
Do you think lowering the radiator pressure limit by changing the $15 cap is a viable tradeoff to save your BMW engine?