found this on blue marble web site
Will Blue Marble® 2-Cycle Oil void my warranty?
The federal law called the “Magnuson Moss Warranty Act of 1974” states that no manufacturer can require you to use their components (oil, etc.) to maintain the factory warranty unless they provide, at no charge during the said warranty period, such product free of charge. Most manufacturers state that the oil you use must meet or exceed the equivalent of specific testing procedures (i.e., TC-W3®, JASO, etc.). Blue Marble® High Performance 2-cycle oil meets or exceeds the specifications of JASO FD, TC-W3®, and ISO EGD.