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Mustang Forums
2011-2014 Mustangs
Driveline/Suspension
MT82 Ideas
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<blockquote data-quote="5lho" data-source="post: 13841504" data-attributes="member: 134994"><p>Transmission oil weights aren't comparable to engine oil weights. 75W90 is roughly the same vis as 10W40 motor oil. They don't use the same viscosity index. </p><p></p><p>DCT is ~75W80, so closer to a 20-30W motor oil. I found it much better than the QS fluid in there originally and it's been down track some 100 times on slicks without problems.</p><p></p><p>Oh and, it's bullshit changing fluid will void your warranty. The dealer mech will just stick a finger in there and verify there is fluid in the trans and move on. He isn't going to to do some sort of CSI UOA on what's in there.</p></blockquote><p></p>
[QUOTE="5lho, post: 13841504, member: 134994"] Transmission oil weights aren't comparable to engine oil weights. 75W90 is roughly the same vis as 10W40 motor oil. They don't use the same viscosity index. DCT is ~75W80, so closer to a 20-30W motor oil. I found it much better than the QS fluid in there originally and it's been down track some 100 times on slicks without problems. Oh and, it's bullshit changing fluid will void your warranty. The dealer mech will just stick a finger in there and verify there is fluid in the trans and move on. He isn't going to to do some sort of CSI UOA on what's in there. [/QUOTE]
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