I think you need to use oil Motul specific 5-30 504.00 / 507.00 Generator sets that we are choosing our country.
I considered the Motul as I've heardd some great things about it, but I've always had great experience with Shell Hellix. Really recommended and also meets VW standards.
https://www.shell.co.uk/motorist/oi...ly-synthetic/shell-helix-ultra-ect-5w-30.html