Transmission Oil

[Mikkofin]

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[Dee]

Nothing specific. Just generally. I get the sense that you are not well informed on EV gearbox design - although I could be wrong of-course.

Personal note: I've spent the past 30 years in product design (automotive, aerospace, space, pharma, water) and struggle a little with second guessing without a little upfront education.

Not looking to start a fight, but just think that it could be helpful to do a little background reading before diving in. Every hour of research will pay off several hours in practical applicaiton.

That article states that an EV doesn't have a transmission but that's definitely not true.
It has a reduction box with fixed gears and that's exactly the same as a gearbox.
I also miss the explanation what transmission oil does: lubrication but also cooling.
Transmission fluid doesn't need changing (at least not within 100K miles) cuz it isn't contaminated with carbon like in motor oil, carbon is the main reason for wear of gears, that's the main reason it needs changing, that's not the case in a transmission.
It's a terrible article.

 

[Murph7355]

That article states that an EV doesn't have a transmission but that's definitely not true.
It has a reduction box with fixed gears and that's exactly the same as a gearbox.
I also miss the explanation what transmission oil does: lubrication but also cooling.
Transmission fluid doesn't need changing (at least not within 100K miles) cuz it isn't contaminated with carbon like in motor oil, carbon is the main reason for wear of gears, that's not the case in a transmission.
It's a terrible article.

I'm not sure a reduction box with fixed gears is the same as a typical transmission with multiple gears in terms of wear profiles etc.

Plus the Taycan's 'box isn't just a fixed reduction one.

I agree that modern oils and boxes don't seem to need oil changes as often as they used to back in the day... So the simple answer would be to follow Porsche service intervals. They may be being cautious but the cost of ignoring their advice is likely to be steep

At 3.5yrs old and 40k miles they haven't mentioned changing it yet.

 

[Murph7355]

Also noticed the thread is over a year old.

Has anyone hit 100k km yet??

 

[Dee]

I'm not sure a reduction box with fixed gears is the same as a typical transmission with multiple gears in terms of wear profiles etc.

Plus the Taycan's 'box isn't just a fixed reduction one.

What's the difference?
It reduces the rpm of the engine (and increases torque), both in EV and ICE.
The only difference is the powerband but technically they are identical.
It doesn't matter if the Taycan has a two-speed gearbox, it's still a reduction box, just like every other gearbox.
Point is, it doesn't need an oil change for the previously mentioned reason.

Edit: with the invention of synthetics it's no longer necessary to change transmission oil within 100K miles.
Synthetics have much longer moleculair HC chains than mineral oils and therefore last much longer.

 

[gnr3312]

Also noticed the thread is over a year old.

Has anyone hit 100k km yet??

Saw someone hit 150,000 miles on reddit

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