On Alfa number 15
AO Platinum Member
Join Date: Dec 2005
Location: United Kingdom
You can get a genuine filter for around that price, including delivery on ebay sometimes.
Check the Opie oils website, the last time I needed oil I bought 10 litres of Fuchs Titan XTR, which came in at not more than £32 including delivery as they had a free carriage offer on at the time.
The XTR is also a semi synthetic like the Selenia, and 10 litres will give you enough for two changes or plenty of topping up, as the car takes 4.4 litres.
You shouldn't need a sump plug but it is always a good idea to change the copper washer.
You will never be cool driving a Vauxhall.