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1) Read the owner's manual to find out the oil requirements for your motor.
2) Buy any brand or type oil that meets those requirements.

Chances are this will lead you to TCW-3 oil. Use any one of them - it really does not matter in the slightest to longevity or reliability. You may find one brand smokes more or less than others (although I doubt it) so if you care about that, buy the one that smokes less.

Tim