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Hi, I have a problem. My Nissan Sunny (Year 2010) AMT takes a long time to engage the D gear after a stop of 4-5 hours or an overnight. There is no sign of ATF leak, gear missing or any kind of sound from the Gear Box.

For moving forward, either I have to keep engine in ideal RPM for 4-5 minutes before engaging D or after starting the engine, engage D and wait for 4-5 minutes. If I engage D earlier than that, the car will remain as if in N Gear. For the R gear no issues at all at any time.

After the car has traveled around 1 to 2KMS, the problem completely goes away and if I shift back to N and back to D again, it will take only a 1 sec delay.

To get the car moving quickly, I have to engage initially 2nd or 1st then 3rd gear finally D and drive it approximately 1KM before the D works.

This problem did not come suddenly. It has been getting worse over the last 2 years, and initially it happened only after an overnight stop in cold season. Now it happens every morning or after a stop of 4-5 hours. The colder the engine is, the longer it takes to get D engaging.

Kindly advise. Thank you.
 

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Make sure the ATF level is at the full mark. Examine the fluid on the dip stick; if it's very dark brown and/or has a burnt smell, the transmission possibly has internal damage, but the transmission just has not figured out it should die yet.

Nissan Type "D" ATF is the factory standard fill for many Nissan transmissions.

Using Dexron III has been known to cause valve sticking in the valve body assembly. You might want to try servicing the transmission using a fluid that is recommended for use in Dexron II applications, like Valvoline Maxlife ATF or Castrol Multi-import ATF, which are both synthetic. Generic Dexron III/Mercon, which is essentially what Nissan Type "D" ATF is, has a thicker viscosity than the original Dexron and Dexron II.
 
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