Dropped off my 2011 CB400 for it's first service at a Honda dealership and wanted to ask a few questions. I asked what oil they were going to use as I bought a K&N oil filter with me, the mechanic stated they will use mineral oil till 6000km... Isn't this way overkill? I was hoping to change to a sythetic blend for a smoother ride. Not only that, the mechanic also said not to use any hi-flow oil filters as they can cause issues and have the engine seize. Apparently they have seen this happen in the past. I have two questions 1.) Is this guy super conservative? 2.) Are there really issues with hi-flow oil filters?