I'd like to thank everyone on here for the advice. Did a 40minuite journey and motorway driving, Within 5 mins I'd got it on my mini ramps cranked the plug and emptied the sump, seemed just over 3litres, so I topped the surplus litre I had in the 4litre tub and did a mini flush. Topped up and tbh it seems to have cured the judder, drives great now. Was easy and saved me a lot of money.
Now for the exhaust lol.
Cheers guys really appreciate it. Feeling confident now lol