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Hybrid Transmission Reliability Question

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My1stFord

My1stFord

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Your differential analogy is pretty good expalantion!

The variable ratios are effected by the two motors working together with the engine. It can be hard to grasp, but think of it as balancing the speed of three things, an engine and two motors (one of which is connected to the wheels). One could go up, others could go down… even to a stop. It’s an infinite combination of those three.

It’s a super simple transmission with few moving parts. No bands or frequently used clutches to contaminate fluid over time either. No external starter motor with gears or alternator with belts either. There is literally nothing to wear out on this system, other than maybe a shaft seal.

This power split planetary system is also much simpler and more efficient than many other hybrids using a regular geared transmission with a motor slapped on the front.
Thanks for that. So the traction motor is the secret sauce to keep the ICE in is rpm sweet spot, I'd assume.
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icegradner

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Im not sure how easy it is to drain and fill the fluid in one but I'd say frequent fluid changes would be the key to long life especially in a CVT type trans. I would never stick to the manufacturer recommendation of "lifetime fluid" in things like transmissions and PTU/AWD units if you plan to keep them for a long time. I haven't been under my wife's Escape 2020 2.5 hybrid with the same trans yet to look for a drain plug. Its only on its second oil change and they are still free at the dealer so I haven't had a reason to. I know its super easy on my '16 escape with the 6f35 to drain and fill cause it has a plug on the bottom and with a long skinny funnel you can refill easily. DIY things like that obviously are becoming more and more rare as cars get newer.
Absolutely no reason to change the transmission fluid often on a eCVT. 100k-150k miles or 5-6 years is what is recommended for these by most techs for an eCVT, (at least Toyota ones anyway, cannot speak to Fords techs). There isn't much to get damaged like an standard CVT or auto transmission. Techs would check the fluid in my Camry Hybrids eCVT, and tell me, "don't bother, it still looks good". Finally just shy of 6 years after it last being done, and 150k on the clock they said, "looks like it finally needs a change". Still smooth as butter, at 14 years old. Enough said.
 

AutobahnSHO

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Ford has been putting this combo into hybrids for quite a few years, with few reported issues. It's very very similar to the Prius but not built by Toyota.

In my mind it's pretty genius! I guess one drawback is space- the same space they fit a turbo engine into can't fit the 2.5L hybrid plus regular starter battery, that battery is under the rear seat in the hybrid.
 

icegradner

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Ford has been putting this combo into hybrids for quite a few years, with few reported issues. It's very very similar to the Prius but not built by Toyota.

In my mind it's pretty genius! I guess one drawback is space- the same space they fit a turbo engine into can't fit the 2.5L hybrid plus regular starter battery, that battery is under the rear seat in the hybrid.
No need for the battery to be under the hood, it isn't used to start the ICE, and having it inside should make it less prone to corrosion. Most hybrids do, and many Europan ICE vehicles, as well.
 

AutobahnSHO

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No need for the battery to be under the hood, it isn't used to start the ICE, and having it inside should make it less prone to corrosion. Most hybrids do, and many Europan ICE vehicles, as well.
Yeah but you lose some storage space.
 

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Absolutely no reason to change the transmission fluid often on a eCVT. 100k-150k miles or 5-6 years is what is recommended for these by most techs for an eCVT, (at least Toyota ones anyway, cannot speak to Fords techs).
Ford Pass maintenance scheduler says 150k miles for transmission fluid change. I think the owners manual has a flexible schedule that takes into account 'special driving' (ie. frequent towing) that cuts that down to about 70kish
 

icegradner

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Ford Pass maintenance scheduler says 150k miles for transmission fluid change. I think the owners manual has a flexible schedule that takes into account 'special driving' (ie. frequent towing) that cuts that down to about 70kish
Most techs seem to feel that time is just as important as distance traveled, thus the year time frame. I know a lot of people get the miles up quickly, but there's no way I'd do 150k miles in 5-6 years, maybe 80k tops.
 

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Thanks for that. So the traction motor is the secret sauce to keep the ICE in is rpm sweet spot, I'd assume.
Yes, although the speed of the second motor/generator (could be operating in either mode) does the most to keep the engine at the desired rpm for the power needed at a given road speed.
 
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kcamp317

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Absolutely no reason to change the transmission fluid often on a eCVT. 100k-150k miles or 5-6 years is what is recommended for these by most techs for an eCVT, (at least Toyota ones anyway, cannot speak to Fords techs). There isn't much to get damaged like an standard CVT or auto transmission. Techs would check the fluid in my Camry Hybrids eCVT, and tell me, "don't bother, it still looks good". Finally just shy of 6 years after it last being done, and 150k on the clock they said, "looks like it finally needs a change". Still smooth as butter, at 14 years old. Enough said.
Guess it comes down to personal preference. I prefer changing my fluids much more often than OEM schedules state. And yea, I know everyone will say its a waste of money but I am savvy at figuring things out and doing DIY maintenance myself. I just think manufacturers build most vehicles as a throw away vehicle when its at the point of needing (or failing parts) due to lack of maintenance that could have been done or want the service repairs vs buying a new vehicle after the repair costs exceed the costs to fix. Guess I'm stubborn but I don't mind learning and doing my own maintenance and fluid changes more often
 

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Guess it comes down to personal preference. I prefer changing my fluids much more often than OEM schedules state. And yea, I know everyone will say its a waste of money but I am savvy at figuring things out and doing DIY maintenance myself. I just think manufacturers build most vehicles as a throw away vehicle when its at the point of needing (or failing parts) due to lack of maintenance that could have been done or want the service repairs vs buying a new vehicle after the repair costs exceed the costs to fix. Guess I'm stubborn but I don't mind learning and doing my own maintenance and fluid changes more often
You are certainly free to change the oil sooner than recommended, no harm there.

But probably less wasteful to use the same changing ratio as other fluids. For example, if the recommended engine oil interval is 10k and you change it at 5k, then if the transmission recommended interval is 150k there is no point in changing it earlier than 75k.

I have always followed manufacture’s recommendations without problems, but I’m also not an overly aggressive driver. Definitely not “severe service” as they say in the manuals.
 

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Yep....each their own. I am curious though. Has anyone been under their Maverick to see if a drain plug is on the transmission?
 

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I've had two automatic transmissions fail on me.
A Jeep YJ 3 speed auto failed, rebuilt, failed again. Big tires and it's a Jeep so understandable.
A stock Tundra, early noughties, began to fail before I sold it.
Granted I'm not the best about transmission flushing but it got me thinking about the Hybrid I may one day recieve. Does it even have a transmission? Did I just purchase a vehicle that doesn't have my least reliable part? That could be a win.
If someone has a link that explains how this ecvt works is appreciate it.
It's not that junk Nissan type design. Ford knows better. Esp w/trucks ..they've been #1 for 44yrs in sales if you weren't aware. Trucks are most competitive segment an there owners highly knowledgeable (well most anyway). You will not get a better designed hybrid of any type or a stronger vehicle(hybrids) in general for this $ or $10k more. Be rest assured !
 

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You are certainly free to change the oil sooner than recommended, no harm there.

But probably less wasteful to use the same changing ratio as other fluids. For example, if the recommended engine oil interval is 10k and you change it at 5k, then if the transmission recommended interval is 150k there is no point in changing it earlier than 75k.

I have always followed manufacture’s recommendations without problems, but I’m also not an overly aggressive driver. Definitely not “severe service” as they say in the manuals.
Always do a break in service on ANY new vehicle esp turbo charged! Is it as necessary as 15-20yrs ago? No. Still a wise move tho...then go onto 5k mi oil change services from there. Do not go 10k or even 8k on any type vehicle w/any type oil! It's just plain foolishness ...as it's foolish to do 3k mi OCI on vehicles nowadays (after the break- in change). I've worked in the auto- manufacturing industry now 27yrs an every engineer I know does a break -in oil change around 1500mis an then 5k mis religiously there on out! All use a good brand full- synthetic motor oil (its cheap)of proper viscosity & MOTORCRAFT filters.. & do not change viscosity for seasons it not the 90s anymore. All has been figured out for your motor to tiniest degree. Enjoy!
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