Originally Posted By: buster
My bad, you are right the Tbn is 10+ for the 5w40.
Dave at redline said last week that the TBN of 5w40 is 8.4 My recent VOA from Blackstone was 11.0 I don't know if it is different testing methods or what but if you ask redline they will say 8.4 so perhaps you were right on the money.
My bad, you are right the Tbn is 10+ for the 5w40.
Dave at redline said last week that the TBN of 5w40 is 8.4 My recent VOA from Blackstone was 11.0 I don't know if it is different testing methods or what but if you ask redline they will say 8.4 so perhaps you were right on the money.