Those plugs are the oil gallies for the oil filter and the oil squirter in the block. they are the main oiling system plugs. it is very rare for those to leak in my experience. they should be fairly tight. I would take them out clean the threads and check to see if there is any debry on the threads. you can put some teflon on them, but be very carefull not to let the teflon get ahead of the plug. the last thing you want is that getting into your oil spuirters or worse cloging any of the oil paths.
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