Do you need a TBN report to determine shearing? - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 3 (permalink) Old 01-17-2009, 06:12 PM Thread Starter
More Power Tim
 
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Do you need a TBN report to determine shearing?

Sending off my first sample for analysis. Do I need to get a TBN test to see if my 6.0 is shearing down the oil?

2006 F-350 PSD FX4 CC LB SRW 4X4

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post #2 of 3 (permalink) Old 01-18-2009, 02:08 AM
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Re: Do you need a TBN report to determine shearing?

No, TBN is a measures of the amount of active additive left in an oil sample. The TBN is useful for people who want to extend their oil drain intervals.
As far as shearing is concerned, what you are looking for on your UOA is the CST Viscosity or SUS Viscosity values on the report. They you can cross reference those values on the Comparative Viscosity chart (https://powerstrokenation.com/forums/...ead.php?t=1503) to see if it is still a 40 weight oil or if it has dropped to a 30 weight, or just post it here when you receive the results.

What type of oil and which lab did you send it to?

Yep, the 6.0 or a 7.3L with big oil sure can shear oil.

2003 F250, Wildman tunes, Faubion trns, Swamps 175/146 SS,van turbo/WW, DI Intercooler, oilguard bypass, intank & pre-pump, reg return, Firestone air bags, Bilsteins, 350 HP/692 TQ
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post #3 of 3 (permalink) Old 01-18-2009, 04:19 AM Thread Starter
More Power Tim
 
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Re: Do you need a TBN report to determine shearing?

Haven't sent it yet, but it is going to Blackstone. Wanted to make sure I didn't need to spend the extra money for the TBN test. Didn't think so but I wanted to make sure before I sent it off.

2006 F-350 PSD FX4 CC LB SRW 4X4

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