when i first got mine i was concerned about this, but i spoke to an engine place, and they said that as its a turbo engine, will will have the same valve seat inserts that an unleaded engine has. also use 97 super unleaded, because it causes less damage than 95 premium unleaded, seems the lower octane make it burn faster and hotter, also can cause the timming to be out on 95 ron (tis only a fraction)
http://www.burtonpower.com/technical...aded_fuel.aspx
also the higher octane can protect the turbo engine from detonation.