More Opinions Wanted.

[hank55]

Hi.[just joined up..!]

1990 Geo Prizm; Vin code6. LSI; 3spd. Auto.

I'm aware that the correct fluid for the differential part of the transaxle is ATF; [according to the manufacture.] Have you ever heard of people putting in gear oil instead [80W-90]. I've had several mechanics tell me that this an an accepted fluid. I had to have a transaxle installed in my Prizm recently and the installer used gear oil [80W-90] instead of the ATF. for the diff. And he's certain that it's alright.
What do you folks think of this. Thank you for your opinions.
Henry

 

[Papa Bear]

Put in what the service/owners manual calls for, why would you use something else ??


Oh, yes ....

 

[crinkles]

As long as the dif and transaxle are seperate, using gear oil won't affect the transmission, gear oil could be OK for a seperate diff. Any lookup guides e.g. at amsoil or the lube manufacturers?

my mum had this motor in her 93 corolla. I loved that car, learnt to drive in it.

From Amsoil lookup:

1990 GEO PRIZM 1.6L 4-cyl Engine Code [6] 4AFE

Differential, Front......AF3 [2]
All TEMPS......
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Torque-Drive Synthetic Transmission Fluid (ATD1G)