Rung my sump nut

[Valdelisbmw]

It's original sump bolt .very often need to change it if has visual wear tear signs .

[John_D]

Vice grip?

[dean-e36]

There is an actual tool for removing rounded nuts. Or cheap option
Try a vice grip

Cut a slot in it and try turn with large flat head and vice grip

Weld a nut onto the bolt and open with spanner

Force oversized torix in.
Endless possibilities

[mac7]

Hi i had a similar problem with a vanos cap nut and had to grind a 3/8 drive in to the nut with a dremel tool

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[hamish262001]

Tap it out with a cold chisel

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[Breihill01]

Tap/beat in the sacrificial torex bit. Also vice grips on the outside where you can grip and some heat before turning all as one. I would heat up and cool down several times to Allow the oil in the sump to lubricate the threads each time you do this oil will get slightly further down.