My BMW E46 developed an oil leak from the valve cover. I originally tried to replace the gasket however it was stuck/melted on to the gasket. I could have got a gasket scraper to remove it all but it looked so bad that I decided to take the plunge and buy a new valve cover. I went for a new one as opposed to buying a second hand one. The second hand ones in my previous experiences don't always sit tight on the cylinder head and can leak. Also after much use in the engine, the cover loses its shape slightly due to the heat and becomes warped. The new one is a genuine BMW product with the gaskets already fitted. Since fitting it my engine is now bone dry of any oil leaks from the cover. It might be pricey but it will do the job in the long run.
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