API GL-5 in GL-4 application

   / API GL-5 in GL-4 application #1  

reb

Platinum Member
Joined
Mar 18, 2002
Messages
943
Location
Central Arizona
Tractor
YM1500D
Just checked out the thread talking about yellow metal compatibility in some grades of transmission oil. That sparked a question. I gather that GL-5 is made for more demanding applications than GL-4, so it seems reasonable that using -4 in -5 applications is probably not good. Are there adverse consequences in using GL-5 in an application that specifies GL-4?
 
   / API GL-5 in GL-4 application #2  
Gl-5 oil has more EP (adds) in the oil and sometime they [transmission] do not like it. Sometimes the synchros do not work.

Now in diff or axle fluid, have at it. USe anything you want.

I would either use a GL-4/Gl-5 oil (dual rated). OR a GL-5/MT-1 type fluid.

Maybe I am wrong here, but this is how I see it.
 
   / API GL-5 in GL-4 application
  • Thread Starter
#3  
Interesting. The reason I ask is the the specs for the SUV I just bought say 80W90 GL-4 is ok for the transmission and transfer case and 80W90 GL-5 is ok for the differentials. I figured it might be simpler to have only one on hand.

Thanks.
 

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