I can't find anything in my handbook that says I should use 98 over 95. (or maybe I just skipped that page to look at more important things lol)
Anyways, 95 doesn't cause burnt valves any more than 98 would. burnt valves are down to running lean, incorrect ignition timing or using poor quality fuel - which can result in carbon buildup. fuels which lack lubrication can also burn your valves - that's not really an issue here though.
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