whatever is the cheapest - its just an adapter that screws into the drain plug, same as Ford etc.

make sure the vehicle level is at normal drive angle when filling and checking, otherwise the fluid level is wrong.

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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)