My 99 S80 sat unused for ~2 weeks in a garage. Two days after putting it back in service I noticed a big puddle of oil under it. I popped the hood & found the right front side of the engine & compartment was covered with oil. I droped the belly pan and found the right front area dripping with oil. The source of the leak was not apparent. It took about ~1/2 qt of oil to top up the engine & I'd estimate this is about how much was on the floor & engine bay. I cleaned up the engine & bay & continued driving. No sign of a leak yet. The car has 52K miles. I use Moble 1 and change it @ 5K intervals.

Has anyone had this experience and if so did you find out what cause it?

Charlie