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Discussion Starter #1
I purchased my '94 nissan altima, 2.4L GXE (manual transmision) from a dealership and I noticed that the specs from the dealership itself REQUIRES 80W-90 GL4 gear oil for the tranny. However, after I pulled some teeth I was informed that they used GL5 equivalent. Naturally, the syncros have been acting up.
How detrimental would it be for me to replace the appropriate fluid knowing that some of the GL5 will still be there?
Is there any way to ensure near maximum exchange?
Should I run the car untill it comes to temp so that the fluid flows out better?
 

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If you have GL5 gear oil in the tranny, drain it ASAP or else it will screw up the synchros. When you drain the tranny, just make sure it is fully warmed up; this way it will drain more thoroughly and don't worry if there's a little bit of the old oil still in there.
 
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