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My last sample of M1 5w-30 I sent to Blackstone was 5k miles in and they said everything looked good and to try 7,000 next. I then put in M1 0w-40 ESP and just took that out after 1 year and only 4,600 miles. I am waiting for the results now of this 4,600 mile oil analysis and will see what they say. I would have pushed this oil further than 4,600 miles but I was 1 year on it and the oil life was at 0% on my dash.
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