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SVT Shelby GT500
Official UOA thread with oil poll
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<blockquote data-quote="UnleashedBeast" data-source="post: 11396020" data-attributes="member: 112023"><p>Here is the very first known UOA of Roush 5W-50 in the Shelby GT500. *That I recall anyway*</p><p></p><p>[ATTACH=full]273192[/ATTACH]</p><p></p><p>Wear metals look very nice, as they should. Your engine has over 20,000 miles in it, the break in process is long over. Lead is following the trends of other 50 grade lubricant samples taken from the GT500. I've seen lead ppm in Motorcraft 5W-50 low as 2, or as high as 22. Between all known MC 5W-50 samples, I've calculated the average of lead to be 8 ppm. That being said, you are in the average window. If you are still concerned about lead/bearing wear....all of my Amsoil UOA samples has never shown more than 2 ppm of lead, and I do not baby this car. I treat her like a prostitute.</p><p></p><p>This lubricant has a more robust detergent additive package than MC 5W-50 ever had. The TBN is still at 5.9 after 3,200 miles. MC would be only be 50% of that amount after this many miles. I did notice that you had one quart of make up oil. This does benefit the TBN reading, and would boost the amount of detergent additives in the tested sample. </p><p></p><p>I see a small level of Manganese in this sample. Have you been using any Torco fuel additives or race fuel? If so, that's to be expected. </p><p></p><p>Viscosity (17.0 cSt) started out much lower than expected from other 50 grade lubricants commonly tested for the GT500. It sheared to a 40 grade, as expected, but not nearly as bad as MC 5W-50. Sheared only 15%</p><p></p><p>Here is the VOA of the same oil for comparison you posted a long time back. </p><p></p><p></p><p></p><p>In conclusion, this is a better alternative for those who insist to use the Ford recommended 5W-50, however as most of us know...it's no longer available.</p></blockquote><p></p>
[QUOTE="UnleashedBeast, post: 11396020, member: 112023"] Here is the very first known UOA of Roush 5W-50 in the Shelby GT500. *That I recall anyway* [ATTACH=full]273192[/ATTACH] Wear metals look very nice, as they should. Your engine has over 20,000 miles in it, the break in process is long over. Lead is following the trends of other 50 grade lubricant samples taken from the GT500. I've seen lead ppm in Motorcraft 5W-50 low as 2, or as high as 22. Between all known MC 5W-50 samples, I've calculated the average of lead to be 8 ppm. That being said, you are in the average window. If you are still concerned about lead/bearing wear....all of my Amsoil UOA samples has never shown more than 2 ppm of lead, and I do not baby this car. I treat her like a prostitute. This lubricant has a more robust detergent additive package than MC 5W-50 ever had. The TBN is still at 5.9 after 3,200 miles. MC would be only be 50% of that amount after this many miles. I did notice that you had one quart of make up oil. This does benefit the TBN reading, and would boost the amount of detergent additives in the tested sample. I see a small level of Manganese in this sample. Have you been using any Torco fuel additives or race fuel? If so, that's to be expected. Viscosity (17.0 cSt) started out much lower than expected from other 50 grade lubricants commonly tested for the GT500. It sheared to a 40 grade, as expected, but not nearly as bad as MC 5W-50. Sheared only 15% Here is the VOA of the same oil for comparison you posted a long time back. In conclusion, this is a better alternative for those who insist to use the Ford recommended 5W-50, however as most of us know...it's no longer available. [/QUOTE]
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Official UOA thread with oil poll
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