Old Tomos A3 - the cylinder is a hexagon shape.
New Tomos A5 - the cylinder is a square shape.
The Older Tomos A3 Manual calls for 220cc's (ml) of 10w30.
The Newer Tomos A5 Manual calls for 220cc's (ml) of Dexron-type ATF.
Some Tomos owners prefer one or the other in the trans instead of what the manual says, and some even use type-F.
Mopeds seem to be as individual as their owners and each has it's own quirks, so basically, use what's best for you, and if you're not sure, follow the manual, 10w30 for the A3, and ATF for the A5.
Hope that helps,