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I've always converted my bikes to Belray Dot5 fully synthetic. It is not hygroscopic and thus never needs changing. As brakes and clutches are close to paint work, it's never a problem if you spill some on it.
Someone told me the US army changed to synthetic in some remote country due to environmental considerations and ended up saving millions of $ on maintenance.
You however have to completely clean the system before changing over.
Also reduces rusting issues.
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