I've been told even tho we are not doing long life service we should use 504 oil because of the supercharger. That's why Castrol SLX Professional 5w30 it's the best.

With all this oil issues and now that I got new piston rings I wont be using anything else than Castrol SLX.

(Ofc I hope I don't need to top up due to oil consumption, it should be fixed now)
 
Even if my cupra was on the long life service I would still have the oil changed every 10k minimum. Just to avoid the cam chain tensioner problems.