hello
i have a question here and can anyone help me out ?
That when we use oil its TBN and viscosity decreases at 2500 hrs but when this oil reaches 2700 hrs than all the results becomes same? could this happen?
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dear friend,
this might happen when a top up is being done ..
this might happen when a top up is being done ..
friend i hope you can reval more of the results..i feel this might be helpful in finding out how significant is the change.
regards
regards
This could be down to a number of issues, without the full picture/elementary results it would be pure guessing. How often do you top up on oil?, was the same grade of oil used?, which oil are you using etc etc, could all have a detrimental affect.
Without top up TBN will diminish with time.(in an engine)
Viscosity can diminish 1/ fuel dilution 2/polymer shear 3/ incorrect viscosity top up.
viscosity can rise due to 1/ soot generation 2/ oxidation, top up with thicker oil.
So viscosity is a battle of factors.
With top up TBN will be raised but not to the new oil level and viscosity changed only slightly.
Results from lab a further variable, not always spot on and can be affected by the sampling.
The answer to your problem could be fuel dilution, which may rise when the engine is not in use or not to temperature, but is driven off when the engine is running for time at normal temperature.ie time of sampling affecting the results.
Viscosity can diminish 1/ fuel dilution 2/polymer shear 3/ incorrect viscosity top up.
viscosity can rise due to 1/ soot generation 2/ oxidation, top up with thicker oil.
So viscosity is a battle of factors.
With top up TBN will be raised but not to the new oil level and viscosity changed only slightly.
Results from lab a further variable, not always spot on and can be affected by the sampling.
The answer to your problem could be fuel dilution, which may rise when the engine is not in use or not to temperature, but is driven off when the engine is running for time at normal temperature.ie time of sampling affecting the results.
Rate of TBN change will aslo vary with differing fuel sulphur levels. has fuel suppl changed?
You can have a crosscheck of the results with other labs also
