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I'm quite interested in your Graphene Additive for Diesel Engines and have a few details I'd like to clarify before proceeding with an order. Specifically, I'd like to know the cost for purchasing two bottles. Additionally, I'm curious about the payment options available. Understanding the payment process will help me plan accordingly. Furthermore, could you provide information on the type of graphene used in your product? Is it Reduced Graphene Oxide (RGO) or Non-Oxidized Graphene Oxide (NGO)? Lastly, do you operate an Alibaba store? It would be great to check out your listings there for easier navigation and order placement. Looking forward to your detailed response!