oil leak and clunking on bumpy roads

Recently I have noticed a small amount of oil being 'sprayed' or blown by the fan near to the oil cooler onto the underside covers of my 1999 1.9 TDI A6. I
cleaned up the oil and put in some Wynns stop leak - 150 mile journey later no leak. Got back from journey and the oil leak is back. It's only a slight amount of oil but I want to avoid any unnecessary upset. Has anyone else had this problem or any ideas what it could be???
Also noticing a slight clunking noise when going over 'potholed' roads very slowly. No real noise otherwise except when sometimes braking down steep hills. Have had the car recalled for the boot covers but no comments were made about the arms. Has anyone any ideas? I have heard about injecting grease into the boot covers to stop the joints drying out, but would this help?
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Oil leaks are never fun. Products like "stop leak" arn't a great idea either. You may have a split oil cooler or hose if it's really coming from that area - but whatever it is its only going to get worse so I'd suggest you get it looked at.

Sounds a lot like control arms. Front lowers are covered under the recall, the rest won't be if the problem is with any of them.
I.
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