Forum Discussion
Cummins12V98
Jun 26, 2013Explorer III
Charlie D. wrote:
I used Blackstone on my previous Duramax-current one has 5900 and did a oil change before a trip. Blackstone said I could extend beyond my 7500 miles oil changes. I always have the TAN checked. I average 10,000 miles per year towing.
It' actually TBN.
Mine was 4.7 with AMZ/OIL 15-40 after 7,500 miles.
I have used Blackstone for many years.
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