Thanks for the replay Pleiades, yes the bike is running fine with the new engine. Just adjusted the valve clearances and it's running sweet as was just concerned about the milky oil inside that cap but you have alleviated my fears. I do run it short journeys, generally 10-15 minutes each way to work and back 5 days a week.

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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