Oils are guaranteed to be miscible if they pass ASTM D6922 which is part of the API licensing requirement. Molygen is not API licensed so you don't automatically know it passed that test, but LM would be fools if it did not (in addition to being subject to multiple lawsuits). But contrary to what someone posted in this thread the oil is not API SN, it is only "recommended for" those applications that require API SN. It is up to LM as to whether it actually meets and achieves all of the requirements of that license.