Valvoline "Restore" & ST 10k blend VOA

[fantastic]

I was talking to a retired GM/Allison fluids engineer yesterday, and they mentioned the condemnation point being when the two crossed. I'd heard that before somewhere? and them saying it validated that with me.

I've been floating this around lately. Some of the big wigs around here say this is false.

2nd page:
https://www.chevronlubricants.com/content/dam/external/industrial/en_us/sales-material/sales-sheet/ENGINE OIL ANALYSIS UNDERSTANDING TAN AND TBN 01-28-2019.pdf

From the chart it appears that you could go a little pass the TBN & be ok before wear trends up quite a bit. I think it's a good start but they even state to look at all the main results as a whole.

"Ultimately, a more comprehensive mix of indicators is needed to provide a full picture of oil health and performance, including:
TAN• Wear metals• Oxidation• Viscosity"

Which I do agree with. It's a good point in the oils life but if it's not affecting anything, based on those other indicators, then the oil can be used further.

 

[fantastic]

This is an even better explanation IMO. Basically, 50-65% of TBN Depletion is when Acid starts rapidly building up. I've seen where some recommend changing oil when TBN hits 50% & that is probably for that reason alone. I think TAN adds an interesting peek into more of the corrosive condition of the oil & it's effects. Thing is trying to find out at which point does that corrosive wear start happening in our individual equipment & that is when looking at the other perimeters can help determine if it's time to dump.

Being repeatably reliable it's safe to assume that is why we don't see widespread adoption of TAN b/c we can sort of already gauge it by measuring Virgin Oil TBN then say at 65% reduction it's time to change it.

https://www.machinerylubrication.com/Read/2170/oil-drain-interval-tan-tbn

 

[jetman]

This is an even better explanation IMO. Basically, 50-65% of TBN Depletion is when Acid starts rapidly building up. I've seen where some recommend changing oil when TBN hits 50% & that is probably for that reason alone. I think TAN adds an interesting peek into more of the corrosive condition of the oil & it's effects. Thing is trying to find out at which point does that corrosive wear start happening in our individual equipment & that is when looking at the other perimeters can help determine if it's time to dump.

Being repeatably reliable it's safe to assume that is why we don't see widespread adoption of TAN b/c we can sort of already gauge it by measuring Virgin Oil TBN then say at 65% reduction it's time to change it.

https://www.machinerylubrication.com/Read/2170/oil-drain-interval-tan-tbn

I believe Detroit Diesel recommends changing the oil when TBN becomes reduced by 2/3rdws from virgin.
If its starts at 12 dump it at 4 or below.

 

[fantastic]

I believe Detroit Diesel recommends changing the oil when TBN becomes reduced by 2/3rdws from virgin.
If its starts at 12 dump it at 4 or below.

That's 65% of TBN so were onto something here...