Should I change the transmission fluid on my G35?

F

Fire0nic3FX

Member
I'm wondering I should do a transmission fluid change on my G35? I'm at 91,000 miles and I have no idea if the previous owner did a tranny flush or drain/refill.

Ive had people tell me that since its at such high mileage now that if I do a flush or drain/fill, it will destroy the transmission because the dirty fluid is becomes a part of the seals and cause the tranny to seize or something when you flush it and destroys it. I don't know if that's true or not.
 
No... the rumor is if you do a complete flush it'll do more harm than leaving it alone. Drain/fill is the normal procedure, I believe.
Drain then fill... drive 200 miles, then drain and fill.
 
i would just drain and fill, but u might run into problems might shock the tranny
 
yeah dont do the flush, I did a few years back on another car I had after my dad advised me not to and why. I did it anyways and the tranny went on me about a week and half later.
 
I'm sure it will.

If you do the flush, wouldn't you experience problems with the tranny?
 
I wonder why the flush is bad, or at least wonder why so many have reported issues after it. I had a friend with a similar problem.
 
Apparently, it ruins the seals the dirty fluid creates. More info about it is in one of the DIY trans fluid threads.
If you had a newly bought car and changed the tranny oil every 30K-40K, I'm sure it wouldn't cause any harm because the oil is still new.
 
g0ldm4g3 said:
Apparently, it ruins the seals the dirty fluid creates. More info about it is in one of the DIY trans fluid threads.
If you had a newly bought car and changed the tranny oil every 30K-40K, I'm sure it wouldn't cause any harm because the oil is still new.
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So dirty fluid creates a seal, so when u flush shouldn't it just cause leaks? How does it destroy anuthing.?

I don't believe in these theories at all, just trying to understand other peoples logic.

Just do drain and fills. Its cheap and easy to do. Somewhat hard to screw up.
 
As your tansmission fluid oxidizes from heat and moisture it gsludges up a bit. There are also a ton of metal particles floating around in there. The thing is most of this gunk settles around seals such as the output/input shafts. The seals get worn out from everyday use and become brittle when the transmission fluid becomes oxidized and removes the petrol reminants in the rubber. The gunk build up around those seals is probably the only thing stopping your transmission from leaking right now. Flushing all these deposits out (you can never get ALL of them) exposes all those seals to fresh new (and thinner) transmission fluid which can easily seep through the imperfections of a worn out seal
 
TurTLeG said:
So dirty fluid creates a seal, so when u flush shouldn't it just cause leaks? How does it destroy anuthing.?

I don't believe in these theories at all, just trying to understand other peoples logic.

Just do drain and fills. Its cheap and easy to do. Somewhat hard to screw up.
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Have you ever done a full transmission flush?

Sent from my SGH-T999 2
 
On my own personal cars, never. Always drain and fills. For other people who paid me to do them yes. Never had one come back from a leak or "blow up". Of course we always refused to do work on burnt trans fluid.
 
Fire0nic3FX said:
I'm wondering I should do a transmission fluid change on my G35? I'm at 91,000 miles and I have no idea if the previous owner did a tranny flush or drain/refill.

Ive had people tell me that since its at such high mileage now that if I do a flush or drain/fill, it will destroy the transmission because the dirty fluid is becomes a part of the seals and cause the tranny to seize or something when you flush it and destroys it. I don't know if that's true or not.
Click to expand...

I would drain and fill every 3 oil changes to keep new fluids flowing in the transmission. However, some may argue that some old fluid is still inside the transmission, but the same could be said of engine oil. Nobody completely flush an engine of all of the old oil before doing a drain and fill, but engines are done that way. In addition, you could even drain and fill your transmission fluid everytime you change your engine oil if you like due to how simple the transmission drain and fill is.
 
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Yes, but you still will have some old fluid in the torque converter. You will have to drain the old fluid out though the cooler line while pouring fresh fluid in the filler pipe while the engine is running in park until you see that the old fluid have been flushed completely out. The procedure will safely remove all the old fluid.
 
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personally im going to do a drain and fill once a year. Its easy and pretty cheap.
 
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