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 10w30 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 15w40 but that doesn't mean it's the same product. Thanks again!