There's no miracle fix, oil vis change etc. You have 2 options:

1. Enjoy life, let an indy do it for you ($$$$$$$$)
2. Elbow grease, keep the $$$$$ in your pocket. And do this

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Stable: e92is, e46 M54B25, e83 N52, e53 N62 - sold, e39 M54B30 R.I.P.