The timing belt is the only thing that would make sense on that side of the engine however, that is even a little much for a timing cover. So a crack in the block that goes into the oil galley would make more sense.
I would suggest getting an oil dye and adding it to the oil then run the engine until you see the oil come out then you should be able to trace the dye to narrow the search area. Or getting a second opinion is never a bad idea before you go with the engine.
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Tuesday, January 21st, 2020 AT 4:36 PM