I have a 2013 service manual; I doubt there's any real difference. I can look for that section PDF if you want. PM me an e-mail address.It is serviceable, else why would it have a drain and fill plug. I have and do my own flushes and have for many years. There is nothing particularly magical about it. Admittedly, the machine does make it easier though. I have already changed out my fluid with Amsoil synthetic transmission fluid but I did not do a full flush at that time, just a drain and refilled a couple times. However, now I aim to install an external filter to catch some of the finer junk that makes it through and in order to do that I need to know which line is the pump line.
Considering the tolerances in a transmission, particularly the valve body, having taken them apart before and seeing first hand, yes, anything that reduces contaminants does make a difference. I mean, imagine the contaminants that are trapped on the magnetic drain plug as it is from the factory. You think that catches all of it? So installing an additional, inline filter supplements that. If I had room I would install a full on oil filter type set up, which I have done before, but it does not look like there will be the room for that in the Soul. Therefore an inline filter will have to do. Easy enough to change out and inexpensive.Would it really make a difference?
Either line should work equally well.
And, do you already have over 100k miles on your Gen-2?
Just curious. Nothing negative.
There have been models here and there that do utilize an external, spin-on type filter. It's just not very common at all. Which is perplexing as a spin on oil filter, at least a good quality one, can trap far smaller particles and has a by-pass mechanism build in should it become clogged, which the internal transmission filters do not have to the best of my knowledge.I wonder why the manufacturers never went with a spin on transmission fluid filter like they have for oil? The screen filter inside an AT may never be checked/replaced since there is no owner access.