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2012-2013 Boss 302 Mustang
motorcraft 5W50 replaced by Mobil 1 by ford?
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<blockquote data-quote="UnleashedBeast" data-source="post: 13320941" data-attributes="member: 112023"><p>There is a lot of misinformation in this thread, everything that has been covered and mythbusted in the GT500 section will apply here as well. </p><p></p><p>Anyone who believes Motorcraft 5W-50 is required in this engine because it will fail with anything else, or void your warranty, is poorly educated on the subject. </p><p></p><p>What you should know about Motorcraft 5W-50 is that it shears rapidly. That means it "thins" to a lighter SAE grade in a very short period of time. Every sample submitted was already a light 40 grade in 1,500 miles of use. Some samples with more miles sheared to a very heavy 30 grade lubricant. </p><p></p><p><strong><a href="http://www.bobistheoilguy.com/viscosity-charts/" target="_blank">Viscosity Chart</a></strong></p><p></p><p>Ford knows this lubricant shears, which is why it has a 7,500+ mile recommended oil change interval in this car. You will not require a lubricant more viscous than a true synthetic 10W-40 in this engine for long session road course racing. For street use only, nothing more than a true synthetic 10W-30. </p><p></p><p>I have subscribed to this thread, as I expect to receive debates, comments, and questions about my post. By all means, post away. Let's discuss this. I guarantee that 9 out of 10 people will understand that 5W-50 isn't even close to the best choice after this discussion is over.</p><p></p><p></p><p></p><p>Some people believe Ford uses special additives in the initial engine fill. They do not. It's only cheap hydrocracked petroleum. That's right, Motorcraft 5W-50 isn't a true synthetic. Shocker!</p><p></p><p></p><p></p><p>All you are doing is driving your engine on the street with excessive oil pressure. Better formulated 5W-50 will maintain their viscosity longer, but that isn't a good thing. Excessive oil pressure is never a good thing. </p><p></p><p>Even the best 5W-50 grades shear, which is one reason why Amsoil will not formulate one. Red Line seems to have the best anti-shear resistance of all 5W-50 formulations, however, in the GT500 engine....it has shown excessive levels of lead ppm wear. Not good!</p><p></p><p></p><p></p><p>It holds up better than Motorcraft 5W-20, but not a top tier true synthetic. When road racing, you want a lubricant than can maintain its high temp/high shear ratings. Motorcraft doesn't do a great job of that. </p><p></p><p>If nothing else is said, just remember.....Motorcraft is a Ford product bottled by Conoco Phillips. It's sufficient to allow your engine to survive, but hardly the best choice for engine efficiency, performance, or protection.</p><p></p><p></p><p></p><p>Let's get deeper into this conversation. </p><p></p><p>Let's say the viscosity of MC 5W-50 is 20.0 cSt @ 100*C and in 1500 miles, it shears down to 14.6 cSt @ 100*F. Then, after another 1,000 miles....it sheared down to 12.8 cSt. </p><p></p><p>Let's say the viscosity of Amsoil 10W-40 is 14.6 cSt @ 100*F, yet retained close to it's virgin viscosity throughout the entire oil change interval. What lubricant would you prefer to use on the road course and/or the highway? My choice would not be Motorcraft, as I would have no idea what condition the lubricant was in at any given time. </p><p></p><p>Ford can't void your warranty, as Amsoil would pass all criteria in a used oil analysis test, assuming you had engine failure and why Ford tested it anyway. The lubricant could never be blamed for the failure. This has already been proven. Besides, of any Boss on the forums that experienced an engine failure, was it ever lubricant related?</p></blockquote><p></p>
[QUOTE="UnleashedBeast, post: 13320941, member: 112023"] There is a lot of misinformation in this thread, everything that has been covered and mythbusted in the GT500 section will apply here as well. Anyone who believes Motorcraft 5W-50 is required in this engine because it will fail with anything else, or void your warranty, is poorly educated on the subject. What you should know about Motorcraft 5W-50 is that it shears rapidly. That means it "thins" to a lighter SAE grade in a very short period of time. Every sample submitted was already a light 40 grade in 1,500 miles of use. Some samples with more miles sheared to a very heavy 30 grade lubricant. [B][URL="http://www.bobistheoilguy.com/viscosity-charts/"]Viscosity Chart[/URL][/B] Ford knows this lubricant shears, which is why it has a 7,500+ mile recommended oil change interval in this car. You will not require a lubricant more viscous than a true synthetic 10W-40 in this engine for long session road course racing. For street use only, nothing more than a true synthetic 10W-30. I have subscribed to this thread, as I expect to receive debates, comments, and questions about my post. By all means, post away. Let's discuss this. I guarantee that 9 out of 10 people will understand that 5W-50 isn't even close to the best choice after this discussion is over. Some people believe Ford uses special additives in the initial engine fill. They do not. It's only cheap hydrocracked petroleum. That's right, Motorcraft 5W-50 isn't a true synthetic. Shocker! All you are doing is driving your engine on the street with excessive oil pressure. Better formulated 5W-50 will maintain their viscosity longer, but that isn't a good thing. Excessive oil pressure is never a good thing. Even the best 5W-50 grades shear, which is one reason why Amsoil will not formulate one. Red Line seems to have the best anti-shear resistance of all 5W-50 formulations, however, in the GT500 engine....it has shown excessive levels of lead ppm wear. Not good! It holds up better than Motorcraft 5W-20, but not a top tier true synthetic. When road racing, you want a lubricant than can maintain its high temp/high shear ratings. Motorcraft doesn't do a great job of that. If nothing else is said, just remember.....Motorcraft is a Ford product bottled by Conoco Phillips. It's sufficient to allow your engine to survive, but hardly the best choice for engine efficiency, performance, or protection. Let's get deeper into this conversation. Let's say the viscosity of MC 5W-50 is 20.0 cSt @ 100*C and in 1500 miles, it shears down to 14.6 cSt @ 100*F. Then, after another 1,000 miles....it sheared down to 12.8 cSt. Let's say the viscosity of Amsoil 10W-40 is 14.6 cSt @ 100*F, yet retained close to it's virgin viscosity throughout the entire oil change interval. What lubricant would you prefer to use on the road course and/or the highway? My choice would not be Motorcraft, as I would have no idea what condition the lubricant was in at any given time. Ford can't void your warranty, as Amsoil would pass all criteria in a used oil analysis test, assuming you had engine failure and why Ford tested it anyway. The lubricant could never be blamed for the failure. This has already been proven. Besides, of any Boss on the forums that experienced an engine failure, was it ever lubricant related? [/QUOTE]
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motorcraft 5W50 replaced by Mobil 1 by ford?
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