If you go to a website like Euro Car Parts they normal show only compatible parts for your car based on the registration details you enter. I've used them without issue, but I'm lucky enough to live close to a store.

 

Get a torch and have a good look at the oil filter cap, use the photos on page two of the pdf to identify which type of filter you need, UFI or Hengst, they are NOT interchangeable, even some Vauxhall main dealers are unaware that there are two different types of oil filters fitted on a Mokka.

 

thanks for both replies guys - a mate whos an engineer came round yesterday and ive ordered the new sump plug and correct oil filter and 5 litres of oil fro Euro car parts and picking them up today and my mate said he will come round a huge jack and newton torque tool and do it for me for free! (but show me how to do it for future) will take about 30 mins he said, hes a fork lift engineer so i trust him... thanks again!