I have found that my knipex cobra head pliers will make quick work of that.

if you have a line wrench then use a longer lever or find a crows foot line wrench and use a breaker bar on that - dont ease on the wrench, go for sudden smacks on it.

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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)