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Oil Quality and Change Interval

oil TBN viscosity

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85 replies to this topic

#81 OFFLINE   ptjones

ptjones

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Posted 21 August 2018 - 06:48 PM

My latest oil change. Everything still looks good at 207k mi. :)

 

Attached File  81418 oil change.pdf   19.3KB   12 downloads

 

Paul


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#82 OFFLINE   fbov

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Posted 22 August 2018 - 01:19 PM

Looks like you used a different oil last time...

Attached File  Bov Oil Data 180822.pdf   39.97KB   3 downloads

 

Starting at the top... and noting your car's first sample occurred at 2x my highest mileage. 

- I see 2x the wear products (Al, Fe) in my car's first 50K than you did in your car's 3rd and 4th
(your data runs ~100-200K odo mileage, right?)

- Mb is the first sign of different oil; your latest matches mine with Ford and Generic oil, while it used to match Mobil1. 

- Are you using oil or fuel additives containing Mn? Your oil has 15x my levels!!

- Ca and Mg clearly show a different oil with a different additive package. 

- Odd that Ba popped... up to my early levels. We had both seen 0 several times, even as this level remains low. 

 

And really odd that your oil viscosity is very consistent... at a higher level than my oil. Of course you've put 2.5x more miles on the oil, just comparing ICE mileage.  I again wish you had consistently measure TBN; oil pH matters! Your oil's chemical age is unmeasured. 

 

No engine failure modes evident, but no conclusions can be reached on oil life either.

 

My oil hit 12 months in June, but I'm holding out on a sample until close to 5K miles. I plan to change it at 10K miles, regardless the calendar, unless the 5K report indicates otherwise. This will also fill out the matrix on my flash-point/fuel-in-oil issue. I've got 5W20 in now, and will see if there' less fuel in the oil with a (minutely) heavier base oil than 0W20, when driving short trips. I already showed that extended high-speed runs in Summer will drive out the fuel. Prior data used short trips, so I need a short-trips-with-5W20 data point. 

 

HAve fun,

Frank



#83 OFFLINE   ptjones

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Posted 23 August 2018 - 10:03 AM

Looks like you used a different oil last time... Yes, 5W-20 Ford semi synthetic 

attachicon.gifBov Oil Data 180822.pdf

 

Starting at the top... and noting your car's first sample occurred at 2x my highest mileage. 

- I see 2x the wear products (Al, Fe) in my car's first 50K than you did in your car's 3rd and 4th
(your data runs ~100-200K odo mileage, right?)Yes

- Mb is the first sign of different oil; your latest matches mine with Ford and Generic oil, while it used to match Mobil1. 

- Are you using oil or fuel additives containing Mn? Your oil has 15x my levels!!  I have used injector cleaner and octane booster

- Ca and Mg clearly show a different oil with a different additive package. 

- Odd that Ba popped... up to my early levels. We had both seen 0 several times, even as this level remains low. 

 

And really odd that your oil viscosity is very consistent... at a higher level than my oil. Of course you've put 2.5x more miles on the oil, just comparing ICE mileage.  I again wish you had consistently measure TBN; oil pH matters! Your oil's chemical age is unmeasured. My WT is probably higher, 190-233*F which might have something to do with it.

 

No engine failure modes evident, but no conclusions can be reached on oil life either.

 

My oil hit 12 months in June, but I'm holding out on a sample until close to 5K miles. I plan to change it at 10K miles, regardless the calendar, unless the 5K report indicates otherwise. This will also fill out the matrix on my flash-point/fuel-in-oil issue. I've got 5W20 in now, and will see if there' less fuel in the oil with a (minutely) heavier base oil than 0W20, when driving short trips. I already showed that extended high-speed runs in Summer will drive out the fuel. Prior data used short trips, so I need a short-trips-with-5W20 data point. 

 

HAve fun,

Frank

At this point it looks like the ICE will last longer than the car. :)

 

Paul



#84 OFFLINE   fbov

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Posted 25 August 2018 - 08:39 PM

Why, is something else wearing out? I've had Volvos dissolve around a good drive train... but you're not in the rust belt. Sky's the limit, perhaps?



#85 OFFLINE   ptjones

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Posted 26 August 2018 - 10:03 AM

I think what I'm saying is the ICE isn't wearing out. With 207k mi., I only have 100k mi. on  the ICE so at 500K mi. I will only have 225k miles on the ICE. :)

 

Paul



#86 OFFLINE   fbov

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Posted 03 November 2018 - 12:25 AM

Attached File  PORTER-181019.pdf   20.91KB   3 downloads

Latest oil quality report, and a summary of all my data. It's all good. 

Attached File  Bov Oil Data 181019.pdf   38.32KB   2 downloads

 

Blackstone's comments focus on the flash-point depression due to fuel in the oil. The previous oil change occurred immediately after a 200 mile run on the NYS Thruway. This change occurred after a period of increasingly shorter trips now that I'm retired. I didn't make 5K miles last year, so I'm leaving the oil in (TBN looks good). I'll sent another sample when I get a chance to do a bunch of highway miles, as well as at 10K.

 

This was my last data point in a test of oil weight effects. 0W20 seemed to allow more fuel in the oil than 5W20. There is no effect seen here. The high level here negates the possibility of any difference between 5W20 and 0W20. Next, I'll be testing the hypothesis that a long high-speed drive is the cure for fuel in the oil. 

 

As to wear...

Al, Cr, Iron and Mn are flat (constant wear rate) when miles on the oil are considered.

Cu and K are dropping strongly, as if their supply was running out

Mb and B vary widely, but they are primarily additives, dependent on the brand of oil installed. Same with Ca, Mg, Ph and Zn. 

 

Si is of special interest, as a measure of air filter efficiency. I have not changed the engine air filter, and I don't intend to do so. As the filter clogs, it should become more efficient in filtering particles. This data does nothing to contradict that hypothesis. We'll see what happens to Si level in the next 5K miles. 

 

Have fun,

Frank


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