Mobil SHC Marine oils??

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39,805
Location
Pottstown, PA
Lurking on XM site ..found Delvac 1 SHC and Mobilgard have a TBN of 16. Higher than the already superb 12 of Delvac 1. This stuff doesn't seem to available anywhere. With such a good TBN ..could we now see a product worthy of UXOCI (ultra extended oil change interval) [Eek!] ?? spec sheet
 
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