Terry or Blackstone Labs Quetion: Royal Purple API 10W30 Baseline TBN??

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658
Location
EU
Don't know about the 10w, but I asked RP about the 5w and their tech advisor reported 9, according to ASTM D-4739 Total Base Number By potentiometric titration.
 
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5,785
Location
Dixie
Outrun, The data I've seen, using ASTM D2896, showed a TBN of approx 11.0, so that would be consistent with a TBN of 9.0 using ASTM D4739. TS
 
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