I'll spare you the marketing guff about oil molecules being magnetised to your engine. Instead here's the important bit;
Castrol Magnatec 10W-40 is suitable for use in automotive petrol and diesel engines where the manufacturer recommends an ACEA A3/B4, A3/B3, API SN/CF or earlier specification 10W-40 lubricant.
awesome. I just noticed I was low on this in the morning. Thanks