Came across this Castrol PDS
With the statement
The product formulation also contains color that is visible only under a UV light, which represents our
signature of authenticity.
Interested if anyone has some Edge professional and a a black light.
I've got some Magnatec Professional, which showed up a blue/purple, which was the same as Delvac 1330 and Caltex C3.
Penrite Racing 5W-30 glowed green.