Fully synthetic or part synthetic?

[PieEater]

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We'll just have to agree to disagree on this. You gave specific example mileages for specific oil types all of which well exceed the manufacturers recommendations. You justify skipping up to 3 out of 4 oil changes (once every 2 years) on the basis that you know how to check the quality of used oil and so you are happy to use your judgement as to when it needs changing. I'm more interested in prolonging the life of my bike than the life of the oil that's in it, so I'll stick to the recommended intervals and the recommended oil.

The question as to how well your bike is cared for only came up after you indicated that you don't follow Yamaha's guidance on oil changes, so as far as I'm concerned that ball is in your court. However I haven't meant to offend you in any way so I apologise if that has been the case.

The post where I compared "two extremes of use, the 200k bike and a race/track day bike" doesn't exist, it's not exactly fair to question my intelligence on something I didn't say.

Like I said in my first post there is little consensus to be found on this topic ..............