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Old 03-10-2013, 06:03 PM   #21
Hodge Podge
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I suspect Ford has there reasons for going with the Motorcraft DCT Fluid 2 XT-11-QDC, and I'm sure economy was one of them. On the other hand, I doubt we'll ever see any transmissions that fail sooner as a result of that decision than if Ford had used a thicker, traditional gear oil.

The focus is a relatively light vehicle powered by a relatively low-torque engine, so the DCT simply won't be subjected to the high-torque and/or heavy load conditions that would warrant a thicker, more viscous fluid. Super Duty trucks and larger for example, may require a thicker transmission fluid for various reasons, but realistically, it's overkill to use that thick a fluid in the focus. (It'd be like running straight 40 or 50w oil in the engine when 5w20 is more than adequate in almost all scenarios)

As a side note, the 5-speed manual in my 1/2-ton Silverado runs GM Synchromesh fluid which, like the Motorcraft Dual Clutch Transmission Fluid2 XT-11-QDC, is closer to water or WD-40 than it is gear oil. 247,000 miles later, it's doing just fine.
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Old 03-10-2013, 07:29 PM   #22
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Quote:
Originally Posted by Hodge Podge View Post
I suspect Ford has there reasons for going with the Motorcraft DCT Fluid 2 XT-11-QDC, and I'm sure economy was one of them. On the other hand, I doubt we'll ever see any transmissions that fail sooner as a result of that decision than if Ford had used a thicker, traditional gear oil.

The focus is a relatively light vehicle powered by a relatively low-torque engine, so the DCT simply won't be subjected to the high-torque and/or heavy load conditions that would warrant a thicker, more viscous fluid. Super Duty trucks and larger for example, may require a thicker transmission fluid for various reasons, but realistically, it's overkill to use that thick a fluid in the focus. (It'd be like running straight 40 or 50w oil in the engine when 5w20 is more than adequate in almost all scenarios)

As a side note, the 5-speed manual in my 1/2-ton Silverado runs GM Synchromesh fluid which, like the Motorcraft Dual Clutch Transmission Fluid2 XT-11-QDC, is closer to water or WD-40 than it is gear oil. 247,000 miles later, it's doing just fine.
I'm sorry but, I would like to see what the differences are and why they chose a different fluid. - manual verses automated manual when the clutches are not involved. I assume they have a reason and I would like to know what it is, it may be important concerning the internals, materials change, lubricity on those materials, corrosion, wear...

WHY the difference? That is the question.
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