I have 144,xxx miles on my Camaro. I changed the oil when the DIC told me to do it. They went out around 118,xxx miles. For what ever reason, I have noticed little oil use. Just over half the oil changes were with synthetic. As you may have deducted, I drive at a steady rate on the interstate with 68 miles one way to work.
If you go onto the Cadillac forums, this problem has been going on years.
I do not use Fram filters either. I believe the problem is some have let their oil get low.
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