In previous chapters of this book, we developed the information that the dissolved oxygen in the fuel institutes reactions which lead to deposit formation. Specifically in Chapter VI, we showed that the dissolved oxygen forms fuel hydroperoxides which are intimately involved in deposit formation. The removal of oxygen has been proposed as a method to improve the thermal stability of a fuel. In particular, this would enable the fuel to stand a more severe stress (higher temperature and/or longer stress time) without forming an unacceptable amount of deposit.