Today it warmed up to the upper 50s and I was working on the engine off and on. At about 4 o'clock I put the bag back on the engine but did not tie it off with my strap like I normally do. So the bag is open but on the engine. Well I come back to the engine around 8:30 and there is a white film all over the engine. It's on the crankshaft, everywhere, on the rods, on the block, everywhere. I guess where it actually warmed up outside to warmer than inside the garage the humidity went up to 90% in the garage. Leaving the bag open allowed the humidity to get in and mix with the leftover oil on my engine. So I get my oil bottle and oil it up real good and tried wiping as much of the white film off as possible. Is this a big deal or am I over reacting?