why should i put marine 2 stroke oil in my outboard and not normal 2 stroke oil does it really matter?

It sounds like you have a small motor, but even then the type crankshaft bearings in your outboard are very different from those in say a chain saw or lawnmower. The reed valve/carb setup is also different........so bottom line is that if you use TC-W-3 oil, your motor will last a very long time. And just a note, that marine TC-W 3 is very different from "normal " 2 stroke oil.

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why should i put marine 2 stroke oil in my outboard and not normal 2 stroke oil does it really matter?

y should i pay 3 times as much for marine oil for my outboard when it works perfectly well with normal everyday 2 stroke oil? it's not that i'm powering up for hours at a time i only speed about for 5 minutes max at any one time

It does matter. Most modern 2 stroke outboards dynamically mix the gas and oil and use a low oil to gas ratio because they run cool. Two stroke motors like a chain saw are designed for a much higher oil gas ratio. It's not so much that you use a "marine" oil as it is you use a 2-stroke oil designed to work properly with the low oil:gas ratio your outboard uses. The cheap 2-stroke oil designed for a chain saw would cause damage to your outboard.

If you use your outboard on or near the sea, it will get salt in it (blown on the wind). The salt will cause corrosion and speed up any trouble that is already occurring. Marine-grade oil contains chemicals to slow this process down.

Of course, if you only ever use your outboard on inland waters, the difference doesn't matter much.

marine two stroke oil is specially formulated for marine engines and the special chemicals that they need to run efficiently and for a longer life, however regular two stroke oil will work

It really does matter.

TCW means "Two Cycle Water-cooled" -- any other oil is formulated for air-cooled engines which typically have higher combustion temps.

Your water-cooled outboard won't generate the heat required to burn it all off. Especially if you aren't running at WOT most of the time.

Excess unburned oil means more and faster carbon build-up on cylinder walls, piston crowns and transfer ports. Coked-up cylinders lead to sticky rings, lost compression, lost power and ultimately, catastrophic engine failure.

It's inevitable.

the engine has a different working environment to say a moped, and therefore has a different requirement for lubricant, it's water cooled for example with salt water which has a different composition to ordinary water, assuming of course its land based counterpart is not air cooled, which would require another type of oil, nowadays the oil is just a medium that pushes the additives round the engine to offset wear.

its all down to this, marine engines run at a higher temp and under more pressure, so use correct oil or risk blowing engine

it might have higher compression? it might run hotter? it might have higher RPMs? ...marine 2 stroke oil might be better for you?....you not putting oil in a lawnmower

marine oil does better with the moisture and temp