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#3407761 - 06/26/14 03:55 PM TBN methodology changing at Blackstone
Kristin Huff Offline

Registered: 10/31/02
Posts: 25
Loc: Ft. Wayne, IN
Dear BITOG Members: We wanted to let you know that we are changing our TBN testing process slightly. We have always run a modified version of ASTM D-4739, but our machine was calibrated using standards that more closely matched to ASTM D-2896. We are now moving to standards that are more closely aligned with D-4739 and the only difference we have noticed is a slight drop in virgin oil TBN readings. The used oil TBN readings are not expected to change much at all, but virgin oils will tend to read a little lower. ASTM D-2896 is a method used by oil companies to provide TBN readings for their virgin product. It uses stronger acids than ASTM D-4739, so it tends to give higher readings. Since we mostly see used oil, we picked ASTM D-4739 as our method of choice, and this change in standards should give us more consistent readings. (ASTM methods are generally available at your local library at no change if you want to see the actual method.)

Because BITOG members tend to watch virgin TBN readings closely, we wanted to let you know about this change. And to help smooth out the transition, we will also be willing to run any samples you wish under both methods so you can see for yourself what type of differences occur. If you want to take advantage of this, just send in your sample and ask for both TBN methods on the oil information slip. Feel free to contact me with any questions you might have.

Ryan Stark
Blackstone Laboratories Inc.

#3407773 - 06/26/14 04:15 PM Re: TBN methodology changing at Blackstone [Re: Kristin Huff]
tinmanSC Offline

Registered: 09/07/10
Posts: 2190
Loc: Oswego, IL
umm... awesome, I guess? Will continue to send samples in!
Cost of Hobby=2L
(Where L=Cost of Lubricant)
95 Lexus SC300 5-spd@200K, 2000 GS300@125K both VML Full Syn+Purolator PSL20195(soon to be Wix)

#3407778 - 06/26/14 04:24 PM Re: TBN methodology changing at Blackstone [Re: Kristin Huff]
OneEyeJack Offline

Registered: 09/14/10
Posts: 3930
Loc: S California
As long as the TBN is close, the trend would be what I'm interested in for any particular vehicle.
84 Honda Civic wagon 5-speed, 440K+ Red Line 0w-30, Red Line MTL
03 Toyota 4Runner V8 2WD, 145K+ Red Line 0w-30, Red Line D4 & 75W85 GL-5

#3407809 - 06/26/14 05:12 PM Re: TBN methodology changing at Blackstone [Re: Kristin Huff]
Kuato Offline

Registered: 10/23/05
Posts: 4067
Loc: 100km south of the border
This should be stickied so everyone can see it.

Ryan/Kristen, do you have an approximate difference in initial TBN between the two methids?
Stop nit picking for crying out loud.

13 F150, 5.0, 33k
04 Wrangler, 2.4, 191k

#3407827 - 06/26/14 05:55 PM Re: TBN methodology changing at Blackstone [Re: Kristin Huff]
yvon_la Offline

Registered: 05/20/14
Posts: 740
Loc: quebec canada
Ty blackstone for going to this trouble in the name of real world accuracy.awsome job!this will likely give more accurate result for used oil analysis comparo .since thw other way differed slightly
Truck driver
Nissan versa note s 2014
Mechanicly inclined

#3411068 - 06/30/14 04:35 PM Re: TBN methodology changing at Blackstone [Re: Kuato]
Kristin Huff Offline

Registered: 10/31/02
Posts: 25
Loc: Ft. Wayne, IN
Sorry about the delay in getting back to your question. I believe the new TBN method will give results that are 25% lower than our old method.

Ryan Stark
Blackstone Labs