The lucas website says their marine grease is calcium sulfate based and is even labeled as such on the tube. The same tube of grease on any other website such as lowes, o'reily's, etc states the grease is lithium based and in their pictures, the tube is not labeled as to what it uses. Is there any difference between suppliers? I can't imagine lucas making two different products under the same label. The reason I ask is that I use this grease on my boat trailer axles and need to buy a new tube, but I don't have a reference because I threw the used tube out. Just wanting to insure I'm not mixing grease bases as I've read some are not compatible with each other. Thoughts?