Transmission Fluid Change

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Old 07-06-2019, 07:53 PM
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Transmission Fluid Change

I bought an 07 G35 sedan about a month ago with 135K miles. I asked the PO if he had changed the transmission fluid or if he knew it had been changed at any point before he got it and he said he didn't change it. I've been reading through the forums and there are many opinions. Some say should be changed only every 100K miles, some say with every 3 oil changes. Some say with higher mileage cars its better not to change it at all or to just drain and fill, while others say flushing is the best option, even though that goes against what Infiniti itself apparently says in some documents somewhere.

Should I get it changed? There aren't any Infiniti dealerships around so I was thinking I could take it to a NIssan dealership. Even then according to the forums, some dealerships never flush while others always flush it. Its all quite confusing.
 
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Old 07-06-2019, 09:21 PM
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Fluid change interval is every 30k miles, "don't change the oil" is a complete myth just like "you can't go back to conventional oil if you ever use synthetic".

Never power flush a transmission, there is a drain plug, drain out the old fluid and add new, only use Nissan Matic J or Matic S. It takes about 4 quarts. The filter is a permanent screen style and does not require servicing.
 
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Old 07-06-2019, 10:16 PM
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+1... don't flush. I paid a dealer to do a flush back in 2014 and about 4 months later the TC went out. Fortunately under extended Infiniti Elite warranty.
 
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Old 07-07-2019, 01:56 AM
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Originally Posted by [email protected] View Post
Fluid change interval is every 30k miles, "don't change the oil" is a complete myth just like "you can't go back to conventional oil if you ever use synthetic".

Never power flush a transmission, there is a drain plug, drain out the old fluid and add new, only use Nissan Matic J or Matic S. It takes about 4 quarts. The filter is a permanent screen style and does not require servicing.
Will u actually get 4 quarts of oil to drain just by removing the plug?
 
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Old 07-07-2019, 11:07 AM
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Originally Posted by xpresident View Post
I bought an 07 G35 sedan about a month ago with 135K miles. I asked the PO if he had changed the transmission fluid or if he knew it had been changed at any point before he got it and he said he didn't change it. I've been reading through the forums and there are many opinions. Some say should be changed only every 100K miles, some say with every 3 oil changes. Some say with higher mileage cars its better not to change it at all or to just drain and fill, while others say flushing is the best option, even though that goes against what Infiniti itself apparently says in some documents somewhere.
Should I get it changed? There aren't any Infiniti dealerships around so I was thinking I could take it to a NIssan dealership. Even then according to the forums, some dealerships never flush while others always flush it. Its all quite confusing.
Nissan recommends changing AT fluid every 30K miles, living in a warmer state that isn't nearly often enough! I haven't gone to a Infiniti stealership since '04 when they told me AT service was $280! Nissan charges less than half of that, my opinion their mechanics are better trained too! Flushing isn't an option, even Nissan doesn't recommend doing so! Just have Nissan do a "Drain & Fill," if the fluid is extremely degraded have it done again in 6 months! Our AT work on line pressure, they must be kept clean and free of any type of burnt fluid or build up!
Gary
 
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Old 07-10-2019, 01:31 PM
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Having not looked at my car, autozone sells a filter. Everyone is saying just drain and refill, do not replace the filter?
 
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Old 07-10-2019, 03:02 PM
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Correct, do not replace the filter. It's behind the valve body/TCM and is a permanent style filter.
 
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