Fluid for Aisin 4-Speeds

[ET16]

I have a 1999 Sabb with this transmission, and I'm wondering what people have found about using current fluids. The original spec is Dex II, I think. Are the LV fluids like Maxlife okay for this trans, or does it like thicker fluids?

 

[SoNic67]

I am sure that the LV fluid will damage it. For example, Castrol says that their synthetic is: "low viscosity formulation specially designed to deliver maximum fuel efficiency for modern automatic transmissions".
I would use something like Castrol "Multi Vehicle Imports", being an Asian transmission. Has higher viscosity than the synthetics (8 cSt at 100C).


PS: I have a similar thread here: https://bobistheoilguy.com/forums/ubbthreads.php/topics/4386683/Castrol_fluids#Post4386683

 

[eljefino]

Which formula maxlife? The traditional "red bottle" covers every flavor of dexron and while it starts off thin it doesn't shear as badly.

 

[Jimzz]

I've used maxlife in those trans just fine.

 

[slacktide_bitog]

The LV fluid will be fine

Remember, the new LV ATF's are synthetic and more shear-stable. So even though their starting visc is lower, it won't shear down past what the older Dexron III was allowed to.

An Aisin 4-speed auto that used Dexron II can use Dexron VI with no problems.

 

[Falcon_LS]

I'm running Dexron-VI in my 4VAW2 with no problems.

 

[Kira]

I drive a 1999 Saab 9-5 SE. I've used the cheapest Dex/Merc available and the transmission shifts imperceptibly. I've used gallons of the MaxLife Dex/Merc LV flushing a friend's '02 9-3 (also 4 speed) without any suggestion of problem.

The LV is what I've used in the 5 speed units. They require Mobil 3309/Toyota T-IV fluid.