Mobil 1 5W-30, 8k mi OCI, 117k mi, Cadillac CTS-V

Joined
Apr 9, 2013
Messages
304
Location
Philadelphia, PA
All mileage is in kilometers not miles. Notes from oil slip: "Normal street use. I had to top up the oil since it was low on the dip stick. I used Red Line 15W-50 as the top-up oil since I had that handy." Previous fill was Red Line 5W-30. Next fill is 5 qts of Mobil 1 0W-40 and 1 qt of Mobil 1 15W-50 since I had those handy.

Unrelated to UOA, but I have gotten the following DTCs since Jan 2021: P0430 and P0420. The typical corrective action is to replace the catalytic converters, however I've noticed no drop in street drivability. I'm guessing they are marginal and I can keep running the cats for now. I had the exhaust system checked for leaks as well as any other obvious problems. We also tested the exhaust back-pressure and it is normal.

13 CTS-V-210407.jpg
 
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