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RE: Mobil 1 15-50 baseline

Bob,
 
Thanks for the data on unused oil.  I'm not familiar with the terms TBN and 
TAN, and couldn't find them in Mobil's data.
 
 > vis. @ 100 deg. C. cST 18.38 (50 wt. from 16.3 to 21.89)
 > TBN 10.9
 > TAN 2.24
 >
 > At 4000-4500 miles oil usually shows viscosity of about 17.00, TBN 
 > about  4.77, TAN about 4.43, silicon about 8 using BMW air and oil 
 > filters,  solida about .1 (% of vol.)
 
Could you explain please?  TIA.
 
 Regards,
 Jerry
 Arlington, TX (22-Sep-96, 07:03)
 '95 540i-6 spd