What is the service interval for changing the transmission fluid ? Just hit 100k recently and I never had the transmission fluid changed even though people say the fluid last a long time

 

Lifetime transmission fluid warranty is the biggest hoax ever. Normally if you wish to keep your car is good practice to change the transmission fluid every 60000 miles or ten years. I personally never does transmission flash but instead just perform a series of drain and refill actually 3 of them every 40000 miles,drain refill and in the few days repeat the same. I always use Nissan Matic S fluid. If you want to know all details about how to replace fluid then let me know and I'll explain it. It's always better to change the transmission fluid frequently than replace the whole tranny.

 

I have a 09 g37 and would like to know the process on how to do it please.

 

Sounds like the "drain and fill" method involves measuring the amount of tranny fluid drained and replacing the same amount. But why not post the entire method here on this thread so we can all examine it?

 

Hi. The procedure is in the factory service manual.

 

Remove drain plug and drain trans fluid and recap
plug
remove fill/overflow plug and fill 3qts using the proper fill adapter to pump, leave this installed until leveling.
start car and move shift lever from P-R-N-D and back pausing at each point for 10seconds, repeat twice.

if doing just one D and F do 3.5qts and proceed to leveling preceder, to do a full “flush” you will repeat above at least 2 more times with final D and F doing 3.5qts before doing the leveling procedure.

to level the fluid, the transmission needs to be between 95-113f when capping the fill/overflow plug, so pull the fill adapter to drain/level accordingly, generally pulling at 95-100f is plenty of time to cap the plug before 113f. The car should remain running after doing the final PRND from before so again plan temp accordingly, starting at 75f or below is plenty of time to be ready to level by 95-100f. Pull the fill adapter and once the fluid is a very thin hair stream just when it turns to a fast drip plug it immediately, and you are complete.

to check trans temp for the leveling procedure, you can use scangauge II, ecutek, consult tool, or a thermostat gun on the trans pan is actually pretty close I have compared it to scangauge II and ecutek.

You can do a single D and F basically in the same
amount of time and effort as an oil change, it’s very simple once you do it once.

I would recommend maybe once every 3-4 oil changes drain and fill trans one time while doing oil change, you can D and F trans before oil is done draining from engine, once oil change is fully completed all that’s left to do is trans leveling procedure and you now did 1 d and f only adding about 5 mins of time to an oil change. After about 9-12 oil changes you’ll have done a full trans “flush”.

 

Here is the adapter that must be installed in refill/fluid level plug to pump fresh fluid . And actually, instead of leveling, etc., I just measure the amount of fluid drained from tranny and add the exact amount back. I do that every 40000 miles and repeat drain and refill 3 times with intervals of a few days in between. The decent fluid pump you can purchase in Walmart, Harbour Freight, or any auto store for about 15-19 dollars. And, remember this is much cheaper than rebuilding your tranny. And do not forget that tranny fluid change must be done when the engine/transmission is still relatively hot.

 

And i use this additive when changing the fluid

 

Here is another really good additive for high-mileage cars

 

Leveling procedure is just way too quick, and easy, and more precise vs measuring. But I know several people do it measuring method just fine.

Personally I wouldn’t use any additives, oem on its own is what’s advised, many may argue additives will have a lesser result, but to each their own.

this is the adapter i use and comes with a pump that screws to 1qt bottles Only 7$.

although a $5.49 fluid transfer pump from harbor freight will work with the adapter to pump fluid more quickly, but the $7 nozzle/pump works perfectly fine especially with 1qt bottles of atf.

Attwood 11891D7 Gear Lube Pump, for Use with 32-Ounce Gear Lube Bottle, Universal Fit, Includes 1 Yamaha Adapter https://a.co/d/bgsfLk5

 

FSM is precise stating 95-113f.

 

I realize that this is an older thread, but this question keeps popping up on this forum with some regularity. Unfortunately, a lot of the responses that people receive are completely devoid of any context and end up doing more harm than good, which is exactly what has happened here so far.

For an example of a prior discussion, you may want to refer to this thread from '18: https://www.myg37.com/forums/g37-sed...estions-2.html There, I explained a lot of the related considerations.

The above is especially important here, where the OP has said that the vehicle has 100K miles and the transmission fluid has never been replaced. With these facts, just about every reputable transmission shop would tell the OP to leave the transmission fluid alone, as trying to replace it for the first time at this mileage is far more likely to do more harm than good.

 

I've watched many of the drain and fill videos (370Z and G37) and prefer the straight forward procedure described in this one:
I change my trannie fluid every 30-40K and use OEM Matic-S.

I bought the following to help put fluid back into the transmission:

I may change the filter out next time as I see people reporting issues online with RE7R01A clogged filters. Here's an example:

 

I was going to post the same thing, but he is very correct. If it hasn't been serviced frequently to manufacturer specs, then an AT becomes a sealed unit. If you change the fluid later you may regret it.

Good luck,


Rick

 

In addition, just to clarify this, Infiniti's explicit recommendation is not to service the automatic transmission in the G37, as there are risks associated with doing so.