Thanks! Yes, you see a lot of 40 & other thicker oils getting gasoline rating since they allow more additives than thinner grades. It's harder to find a 10w-30 CK-4/SN for example. I've added this VOA to the list for reference & we appreciate you doing this. The viscosity is not exactly the same but the additive pack looks almost identical to Castrol GTX 15w-40 but that doesn't mean it's the same product. Thanks again!