Hello, I recently installed a Frantz OBP. Sump is 12 quarts and I may end up running 2 parallel units , but for now have one and have decided to change TP every 2K miles. (1)Assuming I would use a quart to top off change, at what mileage should I do a UOA? - I'm now using AME HDD & Marine 15/40 because it is not CJ, and as I understand it, the CJ is OK, just has lower TBN & also, you have to change oil more often with the CJ. (2)Should I be using the 5/30 series 3000 instead,(Assuming I stay with Amsoil for now)Temps here are 10 to 100F, If UOA's prove I can, I would like to do extended Oil Drain Intervals. If not I am just going to go with Delo or a good mineral oil. Been hearing good things about Schaeffers, and next time I'm in Asheville may pick up some Supreme 9000.(3)I have to pay extra $10 just to get TBN with Blackstone, if not against forum rules, could someone point me in direction of reputable lab that is more reasonable, as I don't know if Blackstone even gives a soot level or %. BTW my engine is a Dodge Cummins Dually, pretty heavily modded, but I don't drag race or sled pull with it, more of a hobby as I don't have sports cars anymore, just pull horse trailers and GN flatbed with it. Thanks, I love this site and appreciate any and every answer or critique.
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