Ford Focus Coupe-Cabriolet 1.6 tdci - Is this excessive Blow By? - emmo1210

Hello All,

I have noticed some blowing coming from the oil fill cap and was unsure as to whether it is excessive or to be worried about? Theres 90K miles on the clock. Doesnt seem to be smoking just pulsing pressure as below

It 1.6 tdci focus

www.youtube.com/watch?v=dauxY3vf8O4&feature=yo...e

Thanks