Manu51

dear all
I've had my 991 gts for four years now and this winter while keeping the car in my garage for some time without driving, I noticed some drops hanging under all three exhaust manifolds and the pipes looking 'wet'. The leaking has now stopped and stayed like this for weeks. I have been at my local Porsche garage, they say it is not oil - which I also tend not to believe - and suggest condensation water - which is hard for me to believe.

photo October 2018

photo December 2018, no running in between
Has anyone experienced this and may have a clue to its origin? Thank you.

LexVan

What is your garage floor surface? Winter storage temp? Next year, park on a thick mil plastic painter's tarp from Home Depot.

Manu51

Thanks for the tip; so you seem to think that it is indeed water? Seems logical, especially as I've seen the engine at the Porsche repair shop and there's no apparent leak at any joint. It's just that I have never had this during previous three winters.
Garage floor is painted concrete. Garage is in house but not heated. Winter storage temp usually not below 10-11C even when it is freezing outside. I have an air dryer in the garage that keeps humidity under 55-60% (not that this matters in winter).