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The front of the engine has a limited number of oil leak sources. There are two end rail plugs for the high pressure oil rails in the front of each head. The oil pump is up front behind the harmonic balancer. A cracked front cover could technically leak, but I would call that one rare. You really need to further isolate the source. I would suggest degreasing it and let it run for a few minutes and then start swabbing those areas with a paper towel.
