Quote:
Originally Posted by OL JENNY
I just checked my containers of Rotella and the old Rotella T jugs had a SM rating, but my new containers of Rotella T4 do not have a SM/SN rating. Shucks
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The reason the new oil doesn't have the SM/SN rating is because they still have the high zddp content. The government doesn't want high zddp used in cars with cat. converters, because it slightly shortens the life of them.