My 1992 Corolla is leaking oil when driving then pools while parked. Already checked the oil pan and no leak. Where else could it be coming from?
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Front main seal is a likely culprit also, where the majority of it is pooling when you park can tell a lot.
One popular possibility is oil leaking past the rear main seal when running, accumulating in the transmission's bellhousing, and then draining from there when parked. Happens a lot when rear mains start to leak.
Oil around the rear of the oil pan, on the bottom of the transmission are all good signs of this.