valve tap when cold or sitting serveral weeks

Any thoughts on valve tap when cold or any additivies that could be recommended. 30k on car and not a daily driver. I saw there were concerns with the valve lash and rockers.

Thanks

Plenty of experts in the forum for a more educated response, but how long does the car have to sit before you hear the chatter? My BMWs have sat for two weeks at a time, with no chatter, but longer spells between start ups could be part of your problem.

Thanks for the response.
May sit for a week or two no problem. Yes you maybe right about the longer no starts. Any thouughts on 0-40 Mobile 1 oil?
Thanks

Technical stuff... Your Service Advisor is the best judge, but while there are several approved oils in the manual, you have to consider your driving style, climate & time of year to really make the right choice. Long down time, heavy grade oil & valve chatter when cold... Yeah, if by cold, you mean cold temperature too, it makes sense. Try starting the car more fequently, better yet if you can take it for a quick drive.

Actually..... Redline does 10w-60, and I've switched.
After a winter sleep the drain down thing is unavoidable. But that first start after is always "fun" knowing about that cold start. But after all these years of reading about fine synthetic motor oils, a characteristic is a certain amount of "cling" to the metal parts that I am convinced is a major reason to use the best synthetics. It is a buffer when you need it most: dry starts, extreme heat, etc.
I prefer the ester based for that reason and ultimate film strength, where the S54 needs it in the lower end.

Recently bought 2007 Z4 and experienced same concern about clatter after a couple weeks layup. Seems to dissipate after warmup. Is it oil related?