Originally Posted By: Loobed
thread tangent/highjack.
Back in the 1960s, I remember some oils having a slight green tint, but I don't think it was died. I think it was Pennzoil.
Why would an oil have a green tint.
The high VI Pennsylvania Grade crude from certain areas in PA, WV, and OH has a natural green tint to it once it's refined. Way back when very few additives were mixed in finished motor oil, the "green" color of motor oils made from Pennsylvania Grade crude was one way the consumer determined "quality." Kendall capitalized on that in the 60s and started drying their top tier (GT-1) oil green because the robust additive packs by then had completely obscured the natural green of the base oil. The old Kendall refinery is now the Brad Penn refinery and Penn-Grade 1 is essentially the modern version of the old Kendal GT-1, still made in the same refinery from the same Penn Grade crude.