OK - As there are motorcycle mineral oils out there that meet the basic specification (SE, SF, SG) would anyone use these if there were a cost advantage over semi-synth? What to people think about the recommended oil change intervals of 4k / 6months, does this cover Yamaha if people use the cheapest SE mineral oil so if you use a higher spec semi-synth or fully synth you can ignore this? 
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:lurk

