Rear main seal would be leaking from under the transmission, not behind the block.
You would notice if it were coming from the valve cover gasket, since you cleaned everything up that is.
I'd say oil cooler o-ring, vtec solenoid gasket, or cam seal. Those are the most common that leak and end up on the back of the block. - If it were the oil pan leaking, it wouldn't be on the block, just dripping straight down the pan.
Quarter size drip really isn't much to be concerned about on a DD
Last edited by 01NightHawk; 02-23-2012 at 12:47 AM.
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