More troubleshooting is in order before any teardown. As mentioned, clean the bottom of the engine and toward the top as much as you can. Then let the engine run until oil reaches operating temperature. With a bright small beam flashlight check for oil leaks from the bottom up. Source of leak can be deceiving so be sure to trace to highest point. If nothing shows, let it sit overnight and check again. I haven't had a case I needed UV dye but no downside.

If you are using a high mileage oil or even most premium brands they have additives for seals. I avoid aftermarket additives other than buying gas that contains Techron over concern then will cause other problems and they are masking the problem rather than a permanent fix. But, not being familiar with oil saver, if a can of oil saver will do the job it is a huge cost savings.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas