What is the critical difference in engine lubrication between a traditional 2-stroke (2 tiempos) outboard and a 4-stroke (4 tiempos) outboard?

1. A 2-stroke engine uses no oil at all, running on pure gasoline
2. A 2-stroke engine requires specialized 2-stroke marine oil (TC-W3) mixed with the gasoline, whereas a 4-stroke engine stores lubricating oil in an internal crankcase / oil sump
3. A 4-stroke engine uses seawater mixed directly into the fuel tank for lubrication
4. Both engines use identical vegetable cooking oil in their fuel tanks