If it’s an automatic - replace the seal at the torque converter, and in both cases the trans mounts and guibo.
4 years ago I had a small leak from the rear main seal. I put some Omega 917 ($50 seal conditioner) into the oil. No leak since then. If it goes, I will replace it.
[E39 540i] - with S/C ESS kit (plus some upgrades)
[E34 540iA] - Gone
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