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400ex Oil

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So the guy I bought this 400 from said he ran synthetic oil in it. I was told that once you run synthetic you can't go back. So I put amsoil 10W-40 synthetic in it. Just want to know if that's okay or not. Runs great at the moment

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I would pick a brand and type of oil and stick with it. You won't hurt anything by switching but it isn't customary to keep going back and forth.

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As stated above, no problem going from synthetic to petroleum. Any additive that's compatible with synthetic will be just fine in a petroleum; probably better actually in terms of compatibility. No need to do any flushing or anything beyond a normal drain and oil change when you switch.

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