BasicallyAnF1Car

Cheers, I use Magnatec in my other car every year and have had no trouble, so I think I'll go with that then. Good price at Halfords at the moment too.

https://www.halfords.com/motoring/engine-oils-and-fluids/engine-oil/castrol-magnatec-10w40-a3-b4-oil-4-litre-918615.html

Not sure If I have that sound or not as I don't know what a "normal" engine sounds like!