Which motor? The n55 motor, there are no gaskets. O-ring on the hoses. Dry everything and maybe even add some UV dye to confirm the exact leak source.

If your lucky it's just a leak at a hose o-ring or thermostat.

"Pics or it didn't happen". (upload some with the leak shown)

I took apart one once post mortem and think that was a destructive tear down.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)