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[new echo owner]

Right side as in when you are facing the engine compartment from the front of the car?

Dist o-ring, dist shaft seal, valve cover gasket, head gasket, oil pressure switch, rear main seal, oil pan gasket, trans pan gasket, trans front seal, right axle seal, all of the above can leak oil around that area. Either clean of the oil and check for leak or use dye to trace where the worst one is and work until you don't see any more.

Oil dye is the best bet, eliminate guess work.

N.E.O.