Check the threaded tube the oil filter screws onto. The oil transfer tube screws into the block. It may have an o’ring seal under it. If that tube is loose, or the seal under it is old and cracked, you could have a leak.
Check the threaded tube the oil filter screws onto. The oil transfer tube screws into the block. It may have an o’ring seal under it. If that tube is loose, or the seal under it is old and cracked, you could have a leak.