I did a search on this and only found a couple comments about what it says in the manuals. I looked on online manuals for motors too and read the same thing about they should be stored upright to prevent oil from leakind. However, does that mean that they will leak if you lay them down, or are they just trying to cover themselves? That is one of my deciding points now from getting a 4 stroke (probably Tohatsu 9.8 because of the weight) or a 2 stroke. Just wanted to know if anyone had any problems with laying them down. I would keep it stored upright, but just transporting it sometimes may need to be laid down. Thank you.