The fluid was on the exhaust manifold on the drivers side. It was on the manifold below the rear-most cylinder, closest to the firewall. It definitely didn't come from the oil cap. I didn't put any in the crank case, just the intake and gas tank. Is there some sort of overflow for the intake plenum? I'm pretty sure the fluid was seafoam. And it only leaked out while I was adding the seafoam.. I'll try to post a pic too.