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2011-2014 Mustangs
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<blockquote data-quote="UnleashedBeast" data-source="post: 10778790" data-attributes="member: 112023"><p>I wouldn't consider changing it until 1,500 miles. That's when I changed the oil in my Shelby. It had 5W-50, but now 10W-40. It runs more efficient now, yet protects better due to a superior formulation. 50 grade oil is too heavy for ANY modular in my opinion, and I have already proven it. </p><p></p><p></p><p></p><p>It's a fact 5W-20 was selected for CAFE laws, and no other reason. When the engine is stock, 5W-20 is fine for daily driving. When you begin to mod your engine and add more horsepower, you are increasing the pressure on the bottom end bearings, especially when you are using forced induction or nitrous. Extra pressure requires extra protection, and 5W-20 isn't cutting the mustard. So the switch to 5W-30 is logical. </p><p></p><p>This will answer ALL of your questions, and everyone else as well. It's perfectly fine to use 10W-30 in place of 5W-30 when you are using your car above 32*F. Especially when you take into consideration modding, as outlined above, and high temperatures we have in the southern states. </p><p></p><p>I encourage everyone to read post #30 and #31 in the link provided below to answer all of your questions about what oil to use in your Ford modular engine. </p><p></p><p><a href="http://www.teamshelby.com/forums/index.php?/topic/66091-what-is-the-best-oil-to-use/page__st__20__p__1135418#entry1135418" target="_blank">Team Shelby - Why 10W-30</a></p><p></p><p>Hope this helps Ray.</p></blockquote><p></p>
[QUOTE="UnleashedBeast, post: 10778790, member: 112023"] I wouldn't consider changing it until 1,500 miles. That's when I changed the oil in my Shelby. It had 5W-50, but now 10W-40. It runs more efficient now, yet protects better due to a superior formulation. 50 grade oil is too heavy for ANY modular in my opinion, and I have already proven it. It's a fact 5W-20 was selected for CAFE laws, and no other reason. When the engine is stock, 5W-20 is fine for daily driving. When you begin to mod your engine and add more horsepower, you are increasing the pressure on the bottom end bearings, especially when you are using forced induction or nitrous. Extra pressure requires extra protection, and 5W-20 isn't cutting the mustard. So the switch to 5W-30 is logical. This will answer ALL of your questions, and everyone else as well. It's perfectly fine to use 10W-30 in place of 5W-30 when you are using your car above 32*F. Especially when you take into consideration modding, as outlined above, and high temperatures we have in the southern states. I encourage everyone to read post #30 and #31 in the link provided below to answer all of your questions about what oil to use in your Ford modular engine. [URL="http://www.teamshelby.com/forums/index.php?/topic/66091-what-is-the-best-oil-to-use/page__st__20__p__1135418#entry1135418"]Team Shelby - Why 10W-30[/URL] Hope this helps Ray. [/QUOTE]
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