Can you use TC-W3 in older outboard motors calling for TC-W2?

Yes, TC-W3 oil can be used in older outboard motors that specify TC-W2. TC-W3 is a more advanced formulation that meets or exceeds the requirements of TC-W2, providing better lubrication and protection for the engine. However, it's always advisable to consult the owner's manual or manufacturer recommendations before making any changes to the oil type.