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2011-2014 Mustangs
2011-2014 Mustang Talk
2013 GT now takes 5w50??
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<blockquote data-quote="UnleashedBeast" data-source="post: 11787221" data-attributes="member: 112023"><p>You guys are assuming that a 50 grade lubricant is required because there are no piston squirters, assuming that a 50 grade is too viscous to pump through a squirter. </p><p></p><p>The truth is, the lack of squirters means the piston is going to be much hotter without a constant flow of oil cooling it down. Hotter oil around the piston means a lubricant with a higher high temp/high shear HT/HS is required. This is the viscosity of a lubricant at 300*F (150*C)</p><p></p><p>20 grade lubricants are in the 2.8 range (too light for road racing heat)</p><p></p><p>50 grade lubricants are in the 4.5-5.0 range - good for road racing (robust true synthetic 40 grades are as well)</p></blockquote><p></p>
[QUOTE="UnleashedBeast, post: 11787221, member: 112023"] You guys are assuming that a 50 grade lubricant is required because there are no piston squirters, assuming that a 50 grade is too viscous to pump through a squirter. The truth is, the lack of squirters means the piston is going to be much hotter without a constant flow of oil cooling it down. Hotter oil around the piston means a lubricant with a higher high temp/high shear HT/HS is required. This is the viscosity of a lubricant at 300*F (150*C) 20 grade lubricants are in the 2.8 range (too light for road racing heat) 50 grade lubricants are in the 4.5-5.0 range - good for road racing (robust true synthetic 40 grades are as well) [/QUOTE]
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2013 GT now takes 5w50??
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