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2013-14 Shelby GT500
Lifter/rocker noise...
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<blockquote data-quote="UnleashedBeast" data-source="post: 13966975" data-attributes="member: 112023"><p>Correct you are. It's not the oil, period. </p><p></p><p>Motorcraft shears down to a heavy 30 grade / light 40 grade lubricant with normal use in as little as 1,500 miles. I've seen oil samples with sheared viscosity in the 12.x to 13.x cSt range, consistently. Virgin, it's about 20 cSt. </p><p></p><p>Amsoil AMO 10W-40 maintains a 14.x viscosity thoughout most of the interval. It's also less viscous at cold engine start up at all temps between 32*F and 100*F, despite having a "10W" in front of it. </p><p></p><p>OP, you should have changed the oil filter only....not oil and filter. Then, if the noise went away, it could be blamed on the filter, and Amsoil would warranty it. </p><p></p><p>Changing both the filter and the oil at the same time, resulting in a quieter engine isn't conclusive to lubricant choice.</p><p></p><p></p><p></p><p>I'm afraid your conclusion and thoughts are all wrong, please read above. It could have been a faulty oil filter, could have been a mechanical failure which would have happened no matter lubricant filter choice. Correlation does not imply causation.</p></blockquote><p></p>
[QUOTE="UnleashedBeast, post: 13966975, member: 112023"] Correct you are. It's not the oil, period. Motorcraft shears down to a heavy 30 grade / light 40 grade lubricant with normal use in as little as 1,500 miles. I've seen oil samples with sheared viscosity in the 12.x to 13.x cSt range, consistently. Virgin, it's about 20 cSt. Amsoil AMO 10W-40 maintains a 14.x viscosity thoughout most of the interval. It's also less viscous at cold engine start up at all temps between 32*F and 100*F, despite having a "10W" in front of it. OP, you should have changed the oil filter only....not oil and filter. Then, if the noise went away, it could be blamed on the filter, and Amsoil would warranty it. Changing both the filter and the oil at the same time, resulting in a quieter engine isn't conclusive to lubricant choice. I'm afraid your conclusion and thoughts are all wrong, please read above. It could have been a faulty oil filter, could have been a mechanical failure which would have happened no matter lubricant filter choice. Correlation does not imply causation. [/QUOTE]
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2013-14 Shelby GT500
Lifter/rocker noise...
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