As said, don't over fill. Fill tube only to about half an inch from the top. The piston will displace a bit and raise the level anyway. I'd use 3 in 1 or 20 sae. The small, cheap, general purpose light oil cans from the supermarket are fine and they usually have a convenient nozzle. Not much difference in viscosity to ATF but a bit more sticky and less prone to flow. Might be a good time to pop off the top and fit a new diaphragm after a good clean up.
Yes the lower O ring seal can weep on the carbs with the removable bottom nut but that doesn't look to be the case here.
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