Went to get some HyTranPlus today and they didn't have any but they did have the Ultra. He said that it would mix well with the plus. Anybody have any experience with this product? In the past I've always used the HyTran Plus but for some reason, I think the last time I changed the fluid that I used a different Non-CaseIH product and I'm wondering if I need to flush that old stuff out before I add the new.