Shifting Hasatation
Fleet Mechanic
Joined: Jul 2005
Posts: 1,463
Likes: 103
From: Staten Island, NY
Why? They spent over a billion dollars developing this transmission. Its designed to work with the fluid specified for it. The 10 speed uses a fluid that about equivalent to 10W. The 6 speed uses a fluid that's about equivalent to 20W.
Every transmission is designed to operate properly within a specified internal temperature range. That's the purpose of transmission coolers. Doesn't matter what transmission you have or what weight fluid it uses, if you overheat it, it will die.
The 3.5 EB calls for 5W-30 for operation in temperatures from -20 to 100+. The only exception Ford makes is to use 0W-30 if the temperature regularly gets below -22. The engine is designed for it. My wife's Honda calls for 0W-20 regardless of temperature.
Ford sells these things in parts of the world where a July day in south Texas is like a winter day.
Last edited by PupnDuck; Jul 22, 2017 at 05:21 PM. Reason: Additional Info
Fleet Mechanic
Joined: Feb 2007
Posts: 1,652
Likes: 79
From: Mooresville, NC
The problems at the dealerships with tech crews are many and consumers see (and feel) the results:
-- Technicians have become too reliant on IDS
-- The Ford FACT schools and follow-on training standards have declined over time
-- Technicians are not happy with current pay scales
-- The older techs aren't thrilled with the "electronics" content in newer vehicles (now approaching 40% in some cases) and most, if not all of the, "original thinkers" (Master Techs, experts) see Ford relegating them to button-pushing IDS'rs, too reliant on computerized diagnostics vice their disciplined "components-level" troubleshooting/analysis.
I'm sure I'll get a Tech or two (or dealership reps on this forum) will chime in / claim otherwise, but they're the exceptions ..........
-- Technicians have become too reliant on IDS
-- The Ford FACT schools and follow-on training standards have declined over time
-- Technicians are not happy with current pay scales
-- The older techs aren't thrilled with the "electronics" content in newer vehicles (now approaching 40% in some cases) and most, if not all of the, "original thinkers" (Master Techs, experts) see Ford relegating them to button-pushing IDS'rs, too reliant on computerized diagnostics vice their disciplined "components-level" troubleshooting/analysis.
I'm sure I'll get a Tech or two (or dealership reps on this forum) will chime in / claim otherwise, but they're the exceptions ..........
Senior User
Joined: Apr 2017
Posts: 326
Likes: 1
It's not unusual for automatic transmissions to have built-in safety features for cold weather operation
Ford 5R110W TorqShift Transmission Specs & Ratios
The 6R80 has cold weather operation protections as well. I'm sure the 10R80 does, too.
Not saying that's the problem the OP is having. Not this time of year anyway.
Fleet Mechanic
Joined: Sep 2016
Posts: 1,801
Likes: 48
From: Abilene TX.
All oil getts "thinner" as it heats. actually it just flows better. Multi viscosity oil does as well but it has additives that make it behave like a heavier oil, the oil itself is the low number on the bottle.
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Wagion
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