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Mustang Forums
2012-2013 Boss 302 Mustang
motorcraft 5W50 replaced by Mobil 1 by ford?
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<blockquote data-quote="UnleashedBeast" data-source="post: 13335048" data-attributes="member: 112023"><p>Here we go again. There is always someone who ignores facts about what MC 5W-50 can, and can't do. Road Racing lubricant spec's someone would pay the most attention to is High Temp / High Shear. </p><p></p><p>50 grade lubricants have a virgin HT/HS spec of ~5.0</p><p>40 grade lubricant have a virgin HT/HS spec of ~4.3</p><p>30 grade lubricant have a virgin HT/HS spec of ~3.2</p><p>20 grade lubricant have a virgin HT/HS spec of ~2.8</p><p></p><p>HT/HS is the viscosity of a lubricant when it reaches 150*C (302*F). i.e. the temperature of a lubricant around the pistons during long session racing conditions. Having a higher HT/HS is desirable for road racing. Unfortunately, MC 5W-50 will never maintain a 5.0 HT/HS. The viscosity improver polymers rapidly shear on average 35% in this formulation, resulting in HT/HS lower than 4.0</p><p></p><p>Amsoil 10W-40 will maintain it's viscosity, leaving you with a higher HT/HS for better protection while long session road racing. </p><p></p><p>Also, lighter grade lubricants will dissipate heat more rapidly than more viscous lubricants. Lower heat means a higher viscosity is maintained overall. </p><p></p><p>darreng505, need I remind you that the Ferrari guppy you are referring to has a Ph.D in chemistry, specializing in tribology? No offense, but you are taking Ford's recommendation as gospel while ignoring facts that suggest otherwise. Numbers do not lie, businesses selling their proprietary products for profit potential do.</p></blockquote><p></p>
[QUOTE="UnleashedBeast, post: 13335048, member: 112023"] Here we go again. There is always someone who ignores facts about what MC 5W-50 can, and can't do. Road Racing lubricant spec's someone would pay the most attention to is High Temp / High Shear. 50 grade lubricants have a virgin HT/HS spec of ~5.0 40 grade lubricant have a virgin HT/HS spec of ~4.3 30 grade lubricant have a virgin HT/HS spec of ~3.2 20 grade lubricant have a virgin HT/HS spec of ~2.8 HT/HS is the viscosity of a lubricant when it reaches 150*C (302*F). i.e. the temperature of a lubricant around the pistons during long session racing conditions. Having a higher HT/HS is desirable for road racing. Unfortunately, MC 5W-50 will never maintain a 5.0 HT/HS. The viscosity improver polymers rapidly shear on average 35% in this formulation, resulting in HT/HS lower than 4.0 Amsoil 10W-40 will maintain it's viscosity, leaving you with a higher HT/HS for better protection while long session road racing. Also, lighter grade lubricants will dissipate heat more rapidly than more viscous lubricants. Lower heat means a higher viscosity is maintained overall. darreng505, need I remind you that the Ferrari guppy you are referring to has a Ph.D in chemistry, specializing in tribology? No offense, but you are taking Ford's recommendation as gospel while ignoring facts that suggest otherwise. Numbers do not lie, businesses selling their proprietary products for profit potential do. [/QUOTE]
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2012-2013 Boss 302 Mustang
motorcraft 5W50 replaced by Mobil 1 by ford?
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