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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: 11810576" data-attributes="member: 112023"><p>That is one good reason for the recommendation. The engine would see more damage from being road raced with 5W-20, than using 5W-50 constantly on the street. Motorcraft 5W-50 actually acts more like a 20W-50 above 32*F when it's fresh. After it shears, it's more like a light 10W-40. </p><p></p><p>Ford has a corner market on 5W-50 that actually carries the Ford approval certification. They are the only ones who have it. Castrol dropped the spec, more than likely due to a reformulation that contains higher levels of ZDDP than the Ford spec. allows. If Ford said, we recommend 10W-40 or 5W-40 for track use, their corner market sales would die. Everyone has those grades.</p></blockquote><p></p>
[QUOTE="UnleashedBeast, post: 11810576, member: 112023"] That is one good reason for the recommendation. The engine would see more damage from being road raced with 5W-20, than using 5W-50 constantly on the street. Motorcraft 5W-50 actually acts more like a 20W-50 above 32*F when it's fresh. After it shears, it's more like a light 10W-40. Ford has a corner market on 5W-50 that actually carries the Ford approval certification. They are the only ones who have it. Castrol dropped the spec, more than likely due to a reformulation that contains higher levels of ZDDP than the Ford spec. allows. If Ford said, we recommend 10W-40 or 5W-40 for track use, their corner market sales would die. Everyone has those grades. [/QUOTE]
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2013 GT now takes 5w50??
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