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2012-2013 Boss 302 Mustang
motorcraft 5W50 replaced by Mobil 1 by ford?
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<blockquote data-quote="kcbrown" data-source="post: 13346217" data-attributes="member: 153731"><p>My point is that if 50 weight oil is too viscous (when the engine is warm) for the GT500 (and thus causes elevated lead levels in UOAs), then we should be seeing elevated levels of lead in the UOAs of those GT500s that are run with Motorcraft 5W50. If we do see that, then it follows that running them with Motorcraft 5W50 is not only not the best choice, it's actually a damaging choice in the long run (though said run may be long enough to put the engine beyond the warranty limits, which is probably Ford's primary concern).</p><p></p><p>If we don't see elevated lead levels in those UOAs, then doesn't it follow that it is something other than the high viscosity in RL's 5W50 that is causing the elevated lead levels in the UOAs from GT500s running with that oil?</p></blockquote><p></p>
[QUOTE="kcbrown, post: 13346217, member: 153731"] My point is that if 50 weight oil is too viscous (when the engine is warm) for the GT500 (and thus causes elevated lead levels in UOAs), then we should be seeing elevated levels of lead in the UOAs of those GT500s that are run with Motorcraft 5W50. If we do see that, then it follows that running them with Motorcraft 5W50 is not only not the best choice, it's actually a damaging choice in the long run (though said run may be long enough to put the engine beyond the warranty limits, which is probably Ford's primary concern). If we don't see elevated lead levels in those UOAs, then doesn't it follow that it is something other than the high viscosity in RL's 5W50 that is causing the elevated lead levels in the UOAs from GT500s running with that oil? [/QUOTE]
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2012-2013 Boss 302 Mustang
motorcraft 5W50 replaced by Mobil 1 by ford?
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