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What I was really looking for was the data indicating which WS fluids are fully synthetic and from there, which would be the most suitable for severe HPDE duty, then to go down that list until I find one that lands at a price point I am comfortable with. i do not see/have not seen a list of...

It sounds like there’s not a whole lot of experience taking WS fluid to the extreme on track with which to draw from. I suppose most of the cars with Aisin transmissions are not track focused, ever. I saw 265° transmission temp on my dash at one point. At Buttonwillow which makes me wonder...

Cooler is just fine and the car survived 7 20 minute sessions in near 100° heat. That was at Buttonwillow in Central Valley CA.

Any oil analysis after track usage?

That's just the thing, I see on these very pages that ones that are alleged to be full synthetic (Idemitsu) do not themselves say they are synthetic. Others that you would think have a good shot at being synthetic (Toyota branded WS) are known not to be. Amsoil is great, but costly. Looking...

Sorry to disappoint you but, I came back. :LOL:

Yes, WS as in the Toyota standard of atf for Aisin transmissions. I am running this in a 2014 Cadillac CTS V-Sport with Aisin TL80SN transmission.

Hi all, I am wondering if any particular WS acceptable product is more applicable and will offer a larger safety margin for a hot, heavy HPDE track day as the weather warms up. Open to suggestions.

Yo bro, we're in the same boat. I'm on a Trifecta tuned 2014 with Swift springs, V3 front control arms, ZZP rear trailing arms, a BMR/bastardized rear cradle lockout kit, and 200TW Khumo Ecsta V730s on track wheels. It's a blast. I run Amsoil Signature Series 5w30 and, even after a pretty...