Adam, both myself and my dad use this oil.
Dad has an Evo X that runs 260kw on 98 and about 300kw on E85. I have a Ralliart with about 200-210kw.
Dads Evo X is a 2008 model and has 153000km on it! It's used this oil from about 70000km and he belts the shit of it daily lol. It's seen a few track days and has never seen the slow down message.
My Ralliart has seen 2 trackdays (one in 40 deg heat) and I have NEVER seen the slowdown mesage. In saying that though on the 40 deg day I was monitoring the trans temp with torque (android app) and I didn't let it go over 110 deg. Apparently things melt at 130deg??? Thus I could do 1 full on lap and then a cool down lap repeatedly through the whole 15min session.
So inmo this oil has been thoroughly tested and so far proven to work extremely well

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Once again another one of my opinions, is that the reason we see the mech units failing is that they get moisture on them due to the diaqueen oil. My reasoning is that the diaqueen is NOT a fully synthetic oil and thus when the box gets hot and then cools it would condense on the inside of the box and thus moisture will get in there. The HKS oil is a full synthetic.
Please take all of this as my opinion and NOT a fact. I can only base this on my experience with the HKS oil.
