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Originally Posted By: djlinux64 The issue I have with Mobil 1 is that my father had a 2001 Mercury Sable that was gently driven for 165,000 miles on Mobil 1 5w30 with a 3000 mile OCI and then after that the engine started knocking and smoking!? [censored]? Also, most OCI of Mobil 1 have...