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      07-11-2018, 08:06 AM   #947
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Quote:
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Originally Posted by vincE92M3 View Post
Thanks! Pardon my ignorance, but what significance would that analysis provide?
TBN shows you reserve alkalinity (ability to neutralize acids), and TAN shows you how acidic the oil has become. You want to have those values to establish the proper change interval.
Thanks! Currently I'm changing it once a year, as I only put on 2,500 Miles last year.
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      07-16-2018, 06:11 PM   #948
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LM Synthoil Race Tech GT1 10W-60 VOA

I was curious about the final viscosity of this oil versus the others given the too thick discussions.
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      07-16-2018, 07:48 PM   #949
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I was curious about the final viscosity of this oil versus the others given the too thick discussions.

Looks to be right in the middle for a 10w60 -- most are 23-25 cSt. TWS is 22.7 and the BMW (Shell) stuff is 23.2, for example. Starting TBN looks typical too.

I'm sure it will be fine.
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      07-17-2018, 12:11 AM   #950
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Quote:
Originally Posted by dparm View Post
Looks to be right in the middle for a 10w60 -- most are 23-25 cSt. TWS is 22.7 and the BMW (Shell) stuff is 23.2, for example. Starting TBN looks typical too.

I'm sure it will be fine.
From what I’ve seen with the VOAs I’ve run and others have posted in years past this is only one of three that VOA’d in line with the TDS. Though I’m not asserting one is better than another this is interesting versus others coming in near 10% lighter than their TDS.

Would also be interesting to know more about what’s driving the high TAN.
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      07-17-2018, 09:26 AM   #951
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Quote:
Originally Posted by CarPoor View Post
From what I’ve seen with the VOAs I’ve run and others have posted in years past this is only one of three that VOA’d in line with the TDS. Though I’m not asserting one is better than another this is interesting versus others coming in near 10% lighter than their TDS.

Would also be interesting to know more about what’s driving the high TAN.

Manufacturer data sheets are showing the typical values for that oil. There will always be manufacturing variances and we don't know what those are.

Blackstone's own testing has a margin of error, too.

I don't think that starting TAN is very high. I have seen plenty of VOAs come back with TAN of 4-5. Certain basestock types can cause elevation of TAN, if I remember correctly.
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      07-17-2018, 04:38 PM   #952
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Quote:
Originally Posted by dparm View Post
Manufacturer data sheets are showing the typical values for that oil. There will always be manufacturing variances and we don't know what those are.

Blackstone's own testing has a margin of error, too.
While that is true, I think we are confusing material versus immaterial deviations. Approaching 10% is typically seen as material from my experience and we'd flag it, though I can't say for certain what the SAE or ASTM standards are.
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      07-18-2018, 12:27 PM   #953
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While that is true, I think we are confusing material versus immaterial deviations. Approaching 10% is typically seen as material from my experience and we'd flag it, though I can't say for certain what the SAE or ASTM standards are.

I agree that 10% is substantial. That's enough to push an oil out of grade, in some instances. It could also just be a perfect storm of variances: 5% on the blending side PLUS 5% on Blackstone's side. That seems unlikely but I wouldn't call it impossible.

Years ago, I had a VOA done for Eneos Sustina 0w50 and it came back WAY out of grade -- also about 10%. I was quite surprised by this and contacted Eneos directly. They replied back and said they'd look into it, but multiple follow-up emails went into a black hole and I never heard back.
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      08-06-2018, 04:17 PM   #954
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New report.
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      08-06-2018, 04:44 PM   #955
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New report.
Aluminum up slightly, iron about the same, copper unchanged, lead down slightly = not too bad overall. Consistency is what we want, like Blackstone said. Viscosity still in grade, flashpoint okay, and no contaminants.

The TBN and TAN are equal which isn't really ideal, but I agree you should try a slightly longer interval and see if that causes TAN > TBN. Do you do a lot of short trips? What's your driving style?

I would consider this a good report and the start of a reassuring trend. The next report should be very telling.
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      08-06-2018, 07:46 PM   #956
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Quote:
Originally Posted by dparm View Post
Aluminum up slightly, iron about the same, copper unchanged, lead down slightly = not too bad overall. Consistency is what we want, like Blackstone said. Viscosity still in grade, flashpoint okay, and no contaminants.

The TBN and TAN are equal which isn't really ideal, but I agree you should try a slightly longer interval and see if that causes TAN > TBN. Do you do a lot of short trips? What's your driving style?

I would consider this a good report and the start of a reassuring trend. The next report should be very telling.
Not that many short trips, minimum 10-15 mins when I drive. I sometimes go to store to store after that, does that matter? Most of my driving is on the weekend, I would take it to above 6-7k RPM occasionally like on freeway merges. I do autocross events as well, maybe once a month to two months in this car. I do plan to do the RB's at the next change, or should I try pushing it a little longer?
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      08-07-2018, 11:06 AM   #957
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Quote:
Originally Posted by tigermack View Post
Not that many short trips, minimum 10-15 mins when I drive. I sometimes go to store to store after that, does that matter? Most of my driving is on the weekend, I would take it to above 6-7k RPM occasionally like on freeway merges. I do autocross events as well, maybe once a month to two months in this car. I do plan to do the RB's at the next change, or should I try pushing it a little longer?

Just wanted to make sure this wasn't a car you drove 5 minutes to the train station every day, as that would cause the acid build-up (high TAN).

Why are you changing the rod bearings? Preventative maintenance?
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      08-07-2018, 11:11 AM   #958
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Quote:
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Quote:
Originally Posted by tigermack View Post
Not that many short trips, minimum 10-15 mins when I drive. I sometimes go to store to store after that, does that matter? Most of my driving is on the weekend, I would take it to above 6-7k RPM occasionally like on freeway merges. I do autocross events as well, maybe once a month to two months in this car. I do plan to do the RB's at the next change, or should I try pushing it a little longer?

Just wanted to make sure this wasn't a car you drove 5 minutes to the train station every day, as that would cause the acid build-up (high TAN).

Why are you changing the rod bearings? Preventative maintenance?
Yes, just to buy a peace of mind. What's your take on that?
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      08-08-2018, 07:49 AM   #959
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My report...been trending since I picked up the car.
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      08-17-2018, 12:54 PM   #960
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Liqui Moly with two track days. Short interval because I can't math.
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      08-17-2018, 12:59 PM   #961
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My report...been trending since I picked up the car.

Looks pretty good -- no major deviations from your previous reports.
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      08-30-2018, 05:12 AM   #962
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Question Strange results on 32km

Just received my BlackStone report for "08 38km showing increased Lead and Copper however comments are positive.

Is there something to worry about?

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      11-05-2018, 11:14 PM   #963
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seems like another perfect oil report loving this Shell T6 oil
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      11-07-2018, 12:39 PM   #964
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seems like another perfect oil report loving this Shell T6 oil
Agreed that it looks consistent.

I would also pay for TAN next time.
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      11-12-2018, 11:29 AM   #965
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Quote:
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Agreed that it looks consistent.

I would also pay for TAN next time.

I know! I can't forgetting
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      11-18-2018, 08:21 PM   #966
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Quote:
Originally Posted by BradolfPitler View Post
Just received my BlackStone report for "08 38km showing increased Lead and Copper however comments are positive.

Is there something to worry about?

Id personally look at your options to do bearings. However, if you are not in the right situation to get them done, do one more oil change interval in 5 K and see if it improves.

Levels are high in general - mine were high before the bearing spun, but before I could get another 5k and trend.

Good luck!
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      Yesterday, 04:21 PM   #967
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I’d personally look at your options to do bearings. However, if you are not in the right situation to get them done, do one more oil change interval in 5 K and see if it improves.

Levels are high in general - mine were high before the bearing spun, but before I could get another 5k and trend.

Good luck!
Posted my analysis:

1st reading was car when first received, OCI was calculated from last oil change from previous owner. Higher lead content.
2nd reading was when the car acted strange, with a ticking noise rhymic running up in RPM, with slight ratchet feel in the shifter. Took oil reading and it read high. Turns out bearing spun.
3rd reading was with replacement engine (miles on engine, future readings back to vehicle mileage) - replaced bearings prior to install with VAC / ARP
Car went thru two winters in Michigan being parked outside daily overnight (sub zero temps often) - daily driven year round.

Crazy that there's still zero lead readings pretty much to date.
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