Low ash oil seems to be the new wave in oils, The oil will have to be used in the newer 07's and up, it also has more lubrication value to compensate for ulsd now at the pumps seems to me it's a much better oil anyway of coarse it will cost more but the % of wear improvement will be well worth it. It can be used in 93 and up engines due to the use of silicone seals. Looks like the Shell Rotella T triple protection low ash oil is one of the first.