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Rm85 oil?

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Have some valvoline tc-w3 two stroke oil.read that It causes pre mature piston seizures. Should I use this oil or is a different kind recommended

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I would not suggest it.  Outboard motors operate at a much lower temp, rpm and stress level than a dirtbike.  As a result, the lubrication requirements are very different.  The tc-w3 should have a much lower flash point, which will result in inferior lubrication once you get up to full operating temp and are wringing the RM out down a trail.  You're also likely to have issues with significant carbon buildup on the powervalve and possibly on the rings.

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