One issue is that "Rotella-CK" is not the Rotella that everyone's engine builder has used or recommended in the past. When it was rated CH, CI or CJ that's a entirely different oil than it is now, they dropped the "S" ratings, only the name is the same. Its all spelled out on the ratings on the side of the bottle. Reading the bottle of any motor oil, "APPROVED FOR" is different than "Recommended" or "Meets or Exceeds". So, if its safe for Cat Converters, it maybe isnt good enough for our Pontiacs. Every oil company has continued to remake and substitute their additive package to help auto/truck manufacturers meet emission specs. What is the latest, greatest oil....today?
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1968 Firebird 400 RAII M21, 3.31 12 bolt, Mayfair Maize.
1977 Trans Am W72 400, TH350, 3.23 T Top
Everyone you will ever meet knows something you don't.
Bill Nye.
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