Mobil1 0w40 3500mi/2 track days: Z06 Corvette

Dirty_Howie · Sep 26, 2012

Well here is the latest Blackstone report in the new motor GM gave me after I blew up the first one on the track.

This interval was 3500 miles and 2 open track days (95-105* ambient !!). I used about 1/2 qt which is up from 1/4 qt on previous changes. Tin was up but other metals down.

I also see that my phosphorus and zinc levels keep dropping. Is this because it is bonding to metal in my motor ??

Motor now has 23K miles and 12 track days :rock:

DH

LargeCarManX2 · Sep 27, 2012

5K is reasonable as Blackstone say's....

How many miles do you put on each year?

Maybe this oil will be a twice a year oil change if your in the 10 to 12K a year bracket.

Do your friends call you Dirty?

Dirty_Howie · Sep 27, 2012

I already have 23k and it won't be a yr old till November. I will be doing 2 more track days by then as well.

You can call me Dirty ........

skyship · Sep 27, 2012

Looks good and the OCI could easily be extended. The drop in Zinc from last UOA is not significant. The Zinc figure will often show a minor increase from the VOA as does Calcium and as far as I understand that is normal.

cp3 · Sep 27, 2012

I don't see anything I would worry about. Looks very good especially with the track use.

I would think the difference in P & Zn could also just be batch variation.

Dirty_Howie · Sep 27, 2012

Originally Posted By: skyship
Looks good and the OCI could easily be extended. The drop in Zinc from last UOA is not significant. The Zinc figure will often show a minor increase from the VOA as does Calcium and as far as I understand that is normal.

Yes but it is going down ???

DH

Dirty_Howie · Sep 27, 2012

Originally Posted By: cp3
I don't see anything I would worry about. Looks very good especially with the track use.

I would think the difference in P & Zn could also just be batch variation.

But it has gone down a little EVERY sample in succession !!!!!!

If it were batch variance some would go up.

cp3 · Sep 27, 2012

Yes it has but less than 100ppm over what is possibly 4 different batches. I don't know what Mobil's +/- is for additives but I would think it may be more than a 100ppm range.

At any rate, it still doesn't seem to be causing any issue. On the other hand, I do realize this isn't my car and it's much easier for me to say that...lol. If you are concerned, I would drop Mobil an e-mail detailing what you are seeing and see if they will share some info about their additive tolerances.

rrounds · Sep 27, 2012

The Z06 is hard on oil, that said I would try this mix out
https://bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2538809&page=1
I use this mix 50/50 in my high rpm S2000(red line 8600 rpm)I like the high level of Moly and Phos and Z are a little bit higher than most oils.

ROD

Dirty_Howie · Sep 27, 2012

Thats a good idea and I will. I did contact Blackstone and they said Mobil is probably adjusting the levels. I just find it hard to believe that they are adjusting it every time I do a change which is very frequently if you look at my intervals. I asked them if there was any other possible explanation.

DH

Dirty_Howie · Sep 27, 2012

Appreciate the tip. But do you see something that shows my Z06 is being too hard on this oil ??

DH

cp3 · Sep 28, 2012

I don't know if I would call it adjusting, it's just that in all manufaturing processes there is a tolerance (+/-). It would likely be imposible for them to make every batch identicle so they have a range, if there testing shows that additive to be withing that range, the batch is good.

For example, I received the following from Petro-Canada

Quote:
For Supreme Synthetic 0w30 a typical Calcium (Ca) range is about 1930 to 2350 ppm with 2110 being the typical result.
For Boron (B) the typical range is about 180 to 280 ppm with a typical of 230 ppm.
For Zinc (Zn), the typical is 870 ppm (normal range approx. 760 -940)
For Phos. (P), the typical is 740 ppm (normal range approx. 690 - 840)
For Molybdenum (Mo), the typical is 80 ppm (normal range approx. 63 - 95)

I realize this is PC and not Mobil but your high to low variances on P & Zn are less than the ranges here. I guess if you combine that with adjustments to levels by the manufacturer and margin of error by the lab, you will likely never see a report with identicle levels. Maybe not even from the same batch.

buster · Sep 28, 2012

Great report and great oil. I wouldn't change a thing.

Dirty_Howie · Sep 28, 2012

Originally Posted By: cp3
I don't know if I would call it adjusting, it's just that in all manufaturing processes there is a tolerance (+/-). It would likely be imposible for them to make every batch identicle so they have a range, if there testing shows that additive to be withing that range, the batch is good.

For example, I received the following from Petro-Canada

Quote:
For Supreme Synthetic 0w30 a typical Calcium (Ca) range is about 1930 to 2350 ppm with 2110 being the typical result.
For Boron (B) the typical range is about 180 to 280 ppm with a typical of 230 ppm.
For Zinc (Zn), the typical is 870 ppm (normal range approx. 760 -940)
For Phos. (P), the typical is 740 ppm (normal range approx. 690 - 840)
For Molybdenum (Mo), the typical is 80 ppm (normal range approx. 63 - 95)

I realize this is PC and not Mobil but your high to low variances on P & Zn are less than the ranges here. I guess if you combine that with adjustments to levels by the manufacturer and margin of error by the lab, you will likely never see a report with identicle levels. Maybe not even from the same batch.

I totally understand what you are saying.

BUT, dont you think its strange that EVERY report has gone DOWN. If it was true variance as you speculate there should be some up and down readings. NOT a continuous trend DOWN or in either direction.

Dirty_Howie · Sep 28, 2012

Originally Posted By: buster
Great report and great oil. I wouldn't change a thing.

Thanks

Do you have any comment on the Phos/Zinc trend ???

cp3 · Sep 28, 2012

Honestly, not really but I'm not a statistician though. Some random things do appear to have a pattern. The two middle one's could be just noise from the lab, they are pretty close.

I'm not trying to say you're wrong, I really don't know. Taking the rest of the report into consideration, which to me is pretty good, I don't think it would be a big concern for me.

Dirty_Howie · Sep 29, 2012

Originally Posted By: cp3
Honestly, not really but I'm not a statistician though. Some random things do appear to have a pattern. The two middle one's could be just noise from the lab, they are pretty close.

I'm not trying to say you're wrong, I really don't know. Taking the rest of the report into consideration, which to me is pretty good, I don't think it would be a big concern for me.

I'm actually very happy with the report. As far as I can tell and from what you guys and Blackstone tell me the metal wear is low. So for 24K miles and 12 track days it seems to be good. I just want the correct ZDDP protection....

DH

Dirty_Howie · Oct 1, 2012

After trading a couple of emails Blackstone is going to rerun my oil sample !!!!!

Will post results when I get them.

DH

cp3 · Oct 1, 2012

Cool, any luck with info from Mobil?

edhackett · Oct 1, 2012

The change from the highest to the lowest reading is -5.6% for Zn and -8.0% for P. That is withing the accuracy of what you can expect for a $25 analysis. The EPA allows up to 10% error for the analysis of something even more critical, your drinking water. The analytical techniques used are not exact. Even the highest grade standards used for ICP-OES and ICP-MS are typically +/- 1%. Analyzing to accuracy beyond that takes some very expensive and uncommon techniques.

Ed

Mobil1 0w40 3500mi/2 track days: Z06 Corvette

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