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Mustang Forums
2011-2014 Mustangs
Engine/Tuning
Cold testing - Amsoil Signature 5W-20 vs. Motorcraft 5W-20
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<blockquote data-quote="UnleashedBeast" data-source="post: 13805731" data-attributes="member: 112023"><p>There are comparison vids coming with Mobil 1 EP and Pennzoil Ultra vs. Amsoil Signature.</p><p></p><p></p><p></p><p>Top tier synthetics thicken <strong><em>less</em></strong> as they cool, meaning they are still the correct viscosity at engine operating temperatures. Your fears are unwarranted because you are assuming that since it's less viscous at 15*F it will also be less viscous at 212*F, which of course is untrue.</p><p></p><p>If you baby the engine, or not, you are still starving it for oil in the upper passages on cold start ups during severe weather as we have seen this week in the United States. While other cars in the parking lots were "lugging" on first startup after work, my Mustang started like a top.</p><p></p><p></p><p></p><p>It thickens less, achieving its "hot viscosity" faster than cheaper lubricants, but are not less viscous at the same hot temps. Think of it as a lesser curve in a comparison graph, with both lubricant ending up at the same hot viscosity.</p><p></p><p></p><p></p><p>10,000 miles with Amsoil Signature in an 8 quart sump is easy. Heck, cheap motorcraft's additive package can do that. Amsoil Signature in this car can be used up to 15,000 miles or 1 year, whichever occur first.</p></blockquote><p></p>
[QUOTE="UnleashedBeast, post: 13805731, member: 112023"] There are comparison vids coming with Mobil 1 EP and Pennzoil Ultra vs. Amsoil Signature. Top tier synthetics thicken [B][I]less[/I][/B] as they cool, meaning they are still the correct viscosity at engine operating temperatures. Your fears are unwarranted because you are assuming that since it's less viscous at 15*F it will also be less viscous at 212*F, which of course is untrue. If you baby the engine, or not, you are still starving it for oil in the upper passages on cold start ups during severe weather as we have seen this week in the United States. While other cars in the parking lots were "lugging" on first startup after work, my Mustang started like a top. It thickens less, achieving its "hot viscosity" faster than cheaper lubricants, but are not less viscous at the same hot temps. Think of it as a lesser curve in a comparison graph, with both lubricant ending up at the same hot viscosity. 10,000 miles with Amsoil Signature in an 8 quart sump is easy. Heck, cheap motorcraft's additive package can do that. Amsoil Signature in this car can be used up to 15,000 miles or 1 year, whichever occur first. [/QUOTE]
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Cold testing - Amsoil Signature 5W-20 vs. Motorcraft 5W-20
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