Hi Guys,

Sorry this isn't Astra related, My wife's Corsa has gunk on the oil cap like in the you-tube video below, its not loosing coolant its only driven 3 miles to work and back, i have done an oil and filter change but its still on the cap. 

in the past couple of years its had the cam belt done the head skimmed, as said its not loosing any water from the bottle, 

is this OK? what should i do?

thanks
example of what it looks like below
https://www.youtube.com/watch?v=pwgk255nTjA