MolaKule
Staff member
Just a suggestion: If you're going to show a used oil analysis fluid sample, it would help if you gave a VOA listing or link of the same fluid from a recent analysis.
Analysis Comparisons
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What if there isn't one?
MolaKule
Staff member
I would suggest sending in a clean oil sample for comparitive analysis.
The alternative is to work with an analyst who has a large database of past analysis.
The alternative is to work with an analyst who has a large database of past analysis.
""link of the same fluid from a recent analysis.""
means nothing due to different labs and even batch to batch variation not to mention normal errors
A sample VOA form EXACT lube used is only way to not waste time or money on tests
means nothing due to different labs and even batch to batch variation not to mention normal errors
A sample VOA form EXACT lube used is only way to not waste time or money on tests
Originally Posted By: bruce381
""link of the same fluid from a recent analysis.""
means nothing due to different labs and even batch to batch variation not to mention normal errors
A sample VOA form EXACT lube used is only way to not waste time or money on tests
Having recently seen this illustrated, I agree.
If you look at VOAs of the same oil brand and type of oil from different labs, you'll see the data all over the map, even hough it's the same oil. Different batches may have some variances, but I don't really know by how much.
Anyway, if the VOA and used oil analysis are run at the same time, on the same equipment (often by the same technician), you are very likely to get a useful apples to apples comparison. Below are some VOA and a used oil analysis test results from the same batch, tested by the same lab, at the same time, and in parenthesis are the manufacturer's values for those same specifications of the same oil. These variances were not huge, but if you were to compare the used oil analysis to the factory info, you might be drawn to make some erroneous conclusions.
For example, if you compared the 100C visc (below) of the used oil analysis to the factory number, you might think the oil had thickened. Because we have the VOA from the same batch run on the same equipment, we know that the oil actually sheared a little. It really doesn't matter how the numbers stack up to what the mfr. lists, it's the before and after snapshots you want to see... both looked at through the same microscope.
Properties
Virgin/7500 mile OCI (Mfr Advertised)
Vis @ 40C: 50.83/-- (49.5)
Vis @ 100C: 9.31 cSt/8.9 cSt (8.7)
VI: 168/--(156)
TBN: 13.6/10.0 (12)
""link of the same fluid from a recent analysis.""
means nothing due to different labs and even batch to batch variation not to mention normal errors
A sample VOA form EXACT lube used is only way to not waste time or money on tests
Having recently seen this illustrated, I agree.
If you look at VOAs of the same oil brand and type of oil from different labs, you'll see the data all over the map, even hough it's the same oil. Different batches may have some variances, but I don't really know by how much.
Anyway, if the VOA and used oil analysis are run at the same time, on the same equipment (often by the same technician), you are very likely to get a useful apples to apples comparison. Below are some VOA and a used oil analysis test results from the same batch, tested by the same lab, at the same time, and in parenthesis are the manufacturer's values for those same specifications of the same oil. These variances were not huge, but if you were to compare the used oil analysis to the factory info, you might be drawn to make some erroneous conclusions.
For example, if you compared the 100C visc (below) of the used oil analysis to the factory number, you might think the oil had thickened. Because we have the VOA from the same batch run on the same equipment, we know that the oil actually sheared a little. It really doesn't matter how the numbers stack up to what the mfr. lists, it's the before and after snapshots you want to see... both looked at through the same microscope.
Properties
Virgin/7500 mile OCI (Mfr Advertised)
Vis @ 40C: 50.83/-- (49.5)
Vis @ 100C: 9.31 cSt/8.9 cSt (8.7)
VI: 168/--(156)
TBN: 13.6/10.0 (12)
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