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2011-2014 Mustangs
Engine/Tuning
Synthetic Oils
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<blockquote data-quote="UnleashedBeast" data-source="post: 10784426" data-attributes="member: 112023"><p>Who said anything about extremes? 5W-20 will get 150K miles from a 5.0 easy, enough said there. </p><p></p><p>This topic has evolved into what is BEST for the Ford Modular, not what is sufficient. </p><p></p><p>Ford made an acceptable sacrifice to save money. 99% of modular owners would never know or see the difference the two grades of oils actually make. If you built an engine, and 5W-20 would achieve 150,000 miles before rebuild, would you care that the oil was too light? Not when you are saving millions of dollars a year using 5W-20. If the same engine could have made 200,000 miles with 5W-30, would it be worth it to Ford, never. If a true synthetic in a 5W-30 or 10W-30 could achieve 300,000 or more in the same engine, would Ford care....still wouldn't. Their drivetrain warranty is over at 60,000 miles. People accept that 150,000 miles is average life for an engine. Most people never keep a car beyond 150,000 miles. They trade it off, and it becomes someone else problem. Let's not forget that auto manufacturers want to continue selling the same person a new car over and over. Building a car to last forever isn't economical to a "bean counter".</p><p></p><p>Summary:</p><p></p><p>5W-20 will achieve an acceptable life expectancy from your engine.</p><p></p><p>5W-30 or 10W-30 will get you more miles from your engine before a rebuild is required. Ford engineers know this, but the "bean counters" are more worried about CAFE penalties than an engine you likely will not own, and will not be in warranty at 150,000 miles. </p><p></p><p>It's common sense, not extreme.</p></blockquote><p></p>
[QUOTE="UnleashedBeast, post: 10784426, member: 112023"] Who said anything about extremes? 5W-20 will get 150K miles from a 5.0 easy, enough said there. This topic has evolved into what is BEST for the Ford Modular, not what is sufficient. Ford made an acceptable sacrifice to save money. 99% of modular owners would never know or see the difference the two grades of oils actually make. If you built an engine, and 5W-20 would achieve 150,000 miles before rebuild, would you care that the oil was too light? Not when you are saving millions of dollars a year using 5W-20. If the same engine could have made 200,000 miles with 5W-30, would it be worth it to Ford, never. If a true synthetic in a 5W-30 or 10W-30 could achieve 300,000 or more in the same engine, would Ford care....still wouldn't. Their drivetrain warranty is over at 60,000 miles. People accept that 150,000 miles is average life for an engine. Most people never keep a car beyond 150,000 miles. They trade it off, and it becomes someone else problem. Let's not forget that auto manufacturers want to continue selling the same person a new car over and over. Building a car to last forever isn't economical to a "bean counter". Summary: 5W-20 will achieve an acceptable life expectancy from your engine. 5W-30 or 10W-30 will get you more miles from your engine before a rebuild is required. Ford engineers know this, but the "bean counters" are more worried about CAFE penalties than an engine you likely will not own, and will not be in warranty at 150,000 miles. It's common sense, not extreme. [/QUOTE]
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