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Re: ZDDP oil analysis results
[Re: 62maxwgn]
#1388107
08/08/13 02:06 PM
08/08/13 02:06 PM
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Joined: Nov 2005
Posts: 1,943
San Angelo, Texas, U.S.A.
1968RR
OP
top fuel
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OP
top fuel
Joined: Nov 2005
Posts: 1,943
San Angelo, Texas, U.S.A.
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Quote:
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Brad Penn: 1600-1700 ppm
Brad Penn utilizes the ASTM qualified lab, Southwest Research Institute (SwRI), for additive element testing and reporting. There again, SwRI uses the industry standardized test method, ASTM D5185 (ICP), to determine zinc content of lubricant oils.
As such, Penn Grade 1 oils have between 1540-to-1565 ppm zinc content.
For more, click on Brad Penn’s link - HERE
For more on Southwest Research Institute (SwRI), click on the link - HERE
SWRI does good research and is a reputable institute, but ICP-AES simply isn't as accurate as NAA (it's only the "industry standard" because NAA typically requires access to a nuclear reactor). You will literally not find a single paper in a peer-reviewed scientific journal that claims that ICP-AES is a more sensitive method of trace element analysis than NAA. 
And how minute would be the difference and would it really matter ?
That's a good question and not an easy one to answer. The uncertainties in all of the numbers that we obtained using NAA were less than 1%. I very rarely see ICP-AES data that includes uncertainties and goes into any detail concerning how they were calculated. I would estimate that the ICP-AES data related to motor oil analysis typically have uncertainties of about 5%, but my estimate is only based on ICP-AES uncertainties associated with analysis of other materials, so take that estimate with a grain of salt. They could be better, or they could be worse.
"When I'm in a slump, I comfort myself by saying if I believe in dinosaurs, then somewhere, they must be believing in me. And if they believe in me, then I can believe in me." - Mookie Wilson
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Re: ZDDP oil analysis results
[Re: STROKIE]
#1388109
09/08/13 12:49 AM
09/08/13 12:49 AM
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Joined: Nov 2005
Posts: 1,943
San Angelo, Texas, U.S.A.
1968RR
OP
top fuel
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OP
top fuel
Joined: Nov 2005
Posts: 1,943
San Angelo, Texas, U.S.A.
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At this point, it doesn't look like we're going to try and submit our results to any scientific journals (maybe Car Craft would be interested?), so here are the exact numbers (ZDDP concentrations in ppm):
Red Line 10W30: 1113.00 +/- 12.75 detection limit: 0.68
Super Tech 10W30: 675.44 +/- 7.98 detection limit: 0.82
Valvoline Conventional 10W30: 756.24 +/- 8.86 detection limit: 0.78
Valvoline VR1 10W30: 1296.78 +/- 14.83 detection limit: 0.86
Comp Cams Engine Break-In Oil Additive: 9548.28 +/- 106.97 detection limit: 2.95
Brad Penn Penn-Grade 1 10W30: 1630.61 +/- 18.60 detection limit: 1.09
Royal Purple 10W30: 842.03 +/- 9.75 detection limit: 0.67
Shell Rotella T5 10W30: 1242.12 +/- 14.41 detection limit: 1.13
Lucas 10W30: 824.45 +/- 9.58 detection limit: 0.87
IV Zn 100 ppm Lot: E2-ZN02069: 99.15 +/- 1.49 detection limit: 0.35
The last one is a NIST-calibrated sample that was used to check accuracy. To be blunt, the "industry standard" ICP-MS method people don't typically publish uncertainties for a very good reason.
"When I'm in a slump, I comfort myself by saying if I believe in dinosaurs, then somewhere, they must be believing in me. And if they believe in me, then I can believe in me." - Mookie Wilson
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Re: ZDDP oil analysis results
[Re: 360view]
#1388112
09/08/13 09:48 AM
09/08/13 09:48 AM
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Joined: May 2005
Posts: 4,718
Florida
BDW
master
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master
Joined: May 2005
Posts: 4,718
Florida
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Quote:
Lucas oil is listed,
but what about
Lucas Engine Break-In Oil Additive
TB Zinc-Plus
16 fl oz
"
Just picked up some from Advanced Auto, only $10 (after 30% discount) and enough for 4 oil changes.
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