I found a deal on 3 gal of super UDT for $25. Great price! Just to be sure, it will be okay to mix these 3 gal with super UDT2 when I change the fluids? I think I read somewhere on TBN that it was okay to mix them, even okay to mix UDT with super UDT2. I just don't want to have a problem. Any thoughts? Thanks.