I don't wanna get started on what and how esters work, long story. But you can call these oils as finer, the more costlier an the oil, the refined, the finer which obviously equates to leak spots. But periodically having an eye for leak will help pinpoint bigger problems if any which may arise at some unwanted crisis situations. Some bikes leak right from word go, bad luck you can call it. But most of the bikes do leak FS oil.
Cheers!
VJ


Members do reply to the queries.. Being rude won't get you any good solutions..
Jus was not getting revert... No Castrol users here???



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