[Darren69]

Originally Posted by rollo22

I was told by a Ducati chap that the black clutch fluid is caused by the rubber seal cap in the reservoir

I changed mine to the clear ones as used on new monster and no black fluid

That might be partly true but its more likely to be the slave seals otherwise wouldn't the brake fluid would turn black too?

I'd still be interested to find out more about these clear reservoir seals you mention.