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2012-2013 Boss 302 Mustang
Official GT 5.0/Boss 302 UOA thread
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<blockquote data-quote="UnleashedBeast" data-source="post: 14753334" data-attributes="member: 112023"><p>For street/drag use only, 5W-50 is in fact overkill for your engine. Ford only recommends it in your Boss 302 and the Track Pack GT because they know owners will use them for HPDE. If you use your car for HPDE and drive your car to the edge of cooling limits, I support the use of 5W-50 in your engine. If you do not, it's not required. Fact, the same engine in the Track Pack GT (which calls for 5W-50) is the exact same engine in the Mustang GT (which calls for 5W-20). That's a huge viscosity swing for the same engine. Reason, intended for different purposes. Do you recall in the 70s & 80s, the owners manual of your car had different viscosity recommendations for different driving conditions and ambient temps. Same theory applies here.</p><p></p><p></p><p></p><p>Cheap hydrocracked base oil</p><p>Rapidly shears, losing its viscosity, caused by the use of VI (Viscosity Improving Polymers) which rapidly wear out.</p><p>Very high NOACK Volatility (high evaporation) - If you are not using an oil separator, your engine is soaked with oil contamination in your intake manifold and intake valves, increasing your engine's chance of detonation.</p><p>Not worth the price you pay, especially when you can buy better for about the same price. </p><p></p><p></p><p></p><p>You only scratched the surface.</p><p></p><p></p><p></p><p>No, <a href="http://www.amsoil.com/shop/by-product/motor-oil/gasoline/sae-5w-50-signature-series-100-percent-synthetic-motor-oil/?code=AMRQT-EA&zo=1859448" target="_blank">Amsoil 5W-50</a> makes a fool of Motorcraft's product. </p><p></p><p></p><p></p><p>A few samples from GT500's showed elevated levels of lead ppm in the UOA, suggesting bearing wear. The formulation doesn't shear from a 50 grade lubricant, maintaining its viscosity far better than Motorcraft. When this occurred in two different GT500 engines in the same year, I was a bit shy of Red Line 5W-50.</p><p></p><p></p><p></p><p>Shearing down is a GOOD thing if used for street/drag. However, with what I posted above, that's only one flaw of Ford's 5W-50 formulation.</p><p></p><p></p><p></p><p>I've heard that myth also. If that were true, refer back to the GT vs. Track Pack GT info above. Nothing internal engine is different. Only change is external oil cooler and larger radiator. However, viscosity recommendation change is due to intended use. Rev limiter is also set the same in both cars. Only the Boss 302 is able to rev higher than the standard Coyote.</p><p></p><p></p><p></p><p>Never interpreted that way fellow member.</p></blockquote><p></p>
[QUOTE="UnleashedBeast, post: 14753334, member: 112023"] For street/drag use only, 5W-50 is in fact overkill for your engine. Ford only recommends it in your Boss 302 and the Track Pack GT because they know owners will use them for HPDE. If you use your car for HPDE and drive your car to the edge of cooling limits, I support the use of 5W-50 in your engine. If you do not, it's not required. Fact, the same engine in the Track Pack GT (which calls for 5W-50) is the exact same engine in the Mustang GT (which calls for 5W-20). That's a huge viscosity swing for the same engine. Reason, intended for different purposes. Do you recall in the 70s & 80s, the owners manual of your car had different viscosity recommendations for different driving conditions and ambient temps. Same theory applies here. Cheap hydrocracked base oil Rapidly shears, losing its viscosity, caused by the use of VI (Viscosity Improving Polymers) which rapidly wear out. Very high NOACK Volatility (high evaporation) - If you are not using an oil separator, your engine is soaked with oil contamination in your intake manifold and intake valves, increasing your engine's chance of detonation. Not worth the price you pay, especially when you can buy better for about the same price. You only scratched the surface. No, [URL="http://www.amsoil.com/shop/by-product/motor-oil/gasoline/sae-5w-50-signature-series-100-percent-synthetic-motor-oil/?code=AMRQT-EA&zo=1859448"]Amsoil 5W-50[/URL] makes a fool of Motorcraft's product. A few samples from GT500's showed elevated levels of lead ppm in the UOA, suggesting bearing wear. The formulation doesn't shear from a 50 grade lubricant, maintaining its viscosity far better than Motorcraft. When this occurred in two different GT500 engines in the same year, I was a bit shy of Red Line 5W-50. Shearing down is a GOOD thing if used for street/drag. However, with what I posted above, that's only one flaw of Ford's 5W-50 formulation. I've heard that myth also. If that were true, refer back to the GT vs. Track Pack GT info above. Nothing internal engine is different. Only change is external oil cooler and larger radiator. However, viscosity recommendation change is due to intended use. Rev limiter is also set the same in both cars. Only the Boss 302 is able to rev higher than the standard Coyote. Never interpreted that way fellow member. [/QUOTE]
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