I don't remember what grade of oils we used way back, unlike the OCD types here I recorded nothing. So interesting to see this ad for Castrol oils. I remember they had a sweet smell, and engines running Castrol had a coloured coating, not really cast as shellac, but you sure could tell a Castrol engine. All garages in NZ stocked Castrol....because Castrol held the license to import oil...they all got their oil here because of Castrol, no complaints allowed.