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Thanks for your help! So what you are saying is that QS blend and Motorcraft blend are reasonally comparable? I found Motorcraft to be 88 cents cheaper than QS 4X4. I think i will definitely pursue a lab test at 5K and see how the oil does. What do you think about using 4 Qt.s of motorcraft...

Hello, i am looking for a safe way to guage how i might be able to do a synthetic blend oil change with a 7500 OCI. My car is a 1991 Mercury Cougar XR7 with a 5.0 litre V8. I used Super Tech blend 10w-30 for the last 30K and changed the oil at 4K intervals. At the time, i was afraid to use more...