PAS 14315 is a hydraulic fluid formulated mainly for low temp performance, hence why its a semi-synthetic, with friction modifiers to eliminate noise and groan in PAS use.
I've used a few different ATF's and PAS fluids in the Deefer and Transmax Z was the only one that was as noise free and had the same consistent feel as PAS 14315
I never tried ATF-FS in the PAS.
Bookmarks