In your country it would be far easier to get a vacuum solenoid valve from a toyota/honda etc. from the yard, on toyotas they are the same all over the car, EGR, EVAP, idle up for carby etc..

They are designed to work for long periods of time.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)