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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: 11811170" data-attributes="member: 112023"><p>Castrol shears less than Motorcraft, Red Line shears less than Castrol. </p><p></p><p>The problem with Red Line, it's thick. You can really tell the engine doesn't start as easily in cooler weather. Oil pressure is also through the roof with all 5W-50 formulations, until they shear. </p><p></p><p>Ford recommends this for extreme use, not street driving. A gentlemen by the name of Dr. Haas did extensive testing on his Ferrari that was spec'd for 10W-60 on the race track. However, he found driving the car like a grandma, 5W-20 was acceptable. </p><p></p><p>Another factor many people don't realize, more viscous fluids run hotter. Hotter fluids are less viscous than spec, depending on temperatures. </p><p></p><p>Less viscous fluids run cooler, and retain a bit more viscosity than spec, depending on temperature.</p></blockquote><p></p>
[QUOTE="UnleashedBeast, post: 11811170, member: 112023"] Castrol shears less than Motorcraft, Red Line shears less than Castrol. The problem with Red Line, it's thick. You can really tell the engine doesn't start as easily in cooler weather. Oil pressure is also through the roof with all 5W-50 formulations, until they shear. Ford recommends this for extreme use, not street driving. A gentlemen by the name of Dr. Haas did extensive testing on his Ferrari that was spec'd for 10W-60 on the race track. However, he found driving the car like a grandma, 5W-20 was acceptable. Another factor many people don't realize, more viscous fluids run hotter. Hotter fluids are less viscous than spec, depending on temperatures. Less viscous fluids run cooler, and retain a bit more viscosity than spec, depending on temperature. [/QUOTE]
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2013 GT now takes 5w50??
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