Omega Turbo Charger leak

I have an Omega Turbo Charger with 11.5 hours on it. I noticed a puddle of yellow fluid under it today. It looks small, but when I moved the compressor, it was about 6 inches across in diameter. Has anyone had this issue or does anyone know what it is? Small problem or big problem?

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It fixed itself. Cleaned the floor, opened the case (an adventure-cheap soft Chinese screws way over-torqued), cleaned the inside of the case. Could not see any loose hoses or wet at any connection. Figured what the heck, turn it on. Ran fine and shut off as usual. Did that 5 or 6 times. No leaks. Only thing I can think of-I may have slightly overfilled it (I did top off the water before I last used it) and it must have overflowed. I may have to add a bit of antifreeze next time I need to top off. The yellow looks like good old car antifreeze.