Testing Toyota WS vs Redline D6 vs Aisin WS

Hello everyone.

I have to say that this Prius is a great car, cheap to fix, and has a bulletproof transmission.

I tried near 4 new quarts of Toyota WS at 100k, lasted nearly 10k without getting dark.(still had a mild wine)

Tried 4 quarts of D6 at 110k and the trans became very quiet. The fluid actually conducted a little bit of electrical current enough to feel a slight jerk in the drivetrain by engine revolution. (Not a good feeling so it came out)

Tried 1 quart of Toyota ws with 3 quarts of D6 and it felt smooth without any electrical disruption. Lasted 12k miles without getting dark.

Tried near 4 quarts of Aisin WS and the transmission whine and electrical disruption was silenced and has been running perfect for 70k miles (still bright red)

Prius V at 180K running very smooth.

Toyota WS (40*C= 23.3 cst /100*C =5.3 cst)
Redline D6 (40*C= 28.4 cst /100*C =6.0 cst)
Aisin WS (40*C= 34.7 cst /100*C =7.3 cst)

Cst= centistoke measurement (the greater the number the slower the motion [but better protection in my opinion])

Clearly Aisin developed their own fluid for this very reason. Toyota is skimping by manufacturing WS elsewhere. Aisin is the clear winner.

 

This baloney you speak of does it come with cheese???

 

This Prius has been used as a cross country travel car probably racking 100k per year. The whine came as soon as Toyota ws started to be used as the majority of the fill. The whine goes away completely because aisins ws custom formula, which has acrylamide and a few other formulations that actually works wonders, went from whine to complete silence. Who would of thought Toyota would try to pull this stunt on the fleet. That's why they don't recommend fluid changes. It's because Toyota ws (which corporate determined the fluid of choice) wears down too quickly as compared with the original fill(aisin ws). For people to do many east to west coast trips, this is important knowledge.. On the other hand, redline d6 is using a higher volume of additives to basestock oil which allows it to be more conductive, which prevents high heat static discharge. Static discharge is the reason behind gen1 copper winding coat failures. So the electrical current somewhat gets intermittently grounded not enough to set off a dtc, but enough to feel a minor burp in the electric motors. It also sounds like it's not healthy. Aisin is formulated kinda like only towards their transaxles only.

 

Update. I was able to have a one on one with an aisin tech and they mentioned that you need 1 quart of a proprietary 50w pure hydrotreated petroleum break-in fluid(Toyota 50w or Lucas oil stabilizer). The rest is aisin ws or Idemitsu Matic-J fluid(they're the same exact chemical formula and come from the same factory) You're welcome.