i parked our boxster without ticking, but its been so cold i hasn't been out since late november, i started it just this last weekend, (its getting warm here but the snow is still not gone) and it was ticking too... the oil was changed by the previous owner, (by the dealer) so i'm not sure what they used but will check tomorrow....
i think is just the lifters draining down, so as soon as i can get it out for a short spin would expect it to be gone
Jake: Marvel mystery oil? isn't that like snake oil?, on any other engine we'd just add a little auto trans fluid...?