Quote: Rotella T is still a high zinc and phosphorus oil and the Mobil 1 synthetic 20-50 is a high zinc and phosphorus oil also. It says this right on the back of the Mobil 1 bottle and also explains any of their racing oils will have the twin checkered flag symbol letting you know this.
I should have said Synthetic street oil... cats dont like zinc so thats why it was highly reduced(not eliminated).... all because of cats and emissions
