Thanks for another great reply Pleiades guess I will drain and flush the system asap just to be sure. I drained and refilled with a blue coolant but have no idea what type the original stuff was as it came with the bike and as you said you cannot tell by the colour. I had no idea you were supposed to replace it (oops). Service manual says to replace every 3 years, it could have potentially been in there for 10.

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Now have a 2017 S1000XR Sport SE

2006 XT660X - Cat D write off due to someone pulling out on me - Pipewerx carbon fibre exhausts - Snorkel removed and airbox drilled - DNA stage 1 + 2 air filters - Kevs fuel controller mod - Scottoiler V system - Oxford heated grips - HEL braided brake hoses - Wilbers 540 rear shock - Brembo brake pads - AFAM chain and sprockets - Michelin Pilot Street Radial's - Denali DX Xtreme dual intensity spotlights