Recommendation of oil to avoid tearing

I haven’t heard of any 😅. During the delivery, the gynae/midwife will stretch the skin for you. But unless you have a lot of loose and stretchy skin naturally, most FTMs won’t have a vaginal opening big enough to accomodate a full term baby (hence episiotomy and/or tears). I wouldn’t try stretching the skin down there before labour either. It’s painful and it may remain stretched long term.