I've been looking at a compact track loader, the Takeuchi TL12V, that specifies 10w-30 diesel engine oil for the hydraulic fluid. I'd want to use it at temps as low as a little below -30 F. That seems a bit too cold for 10w-30 in my mind, and I was considering an ATF, like Citgo Transgard Multi-Purpose ATF or something similar, as a substitute. It's available at reasonable prices for fluid today, has a low pour point, and a decent VI. I plan on using the same fluid year round, so it would see outdoor air temps in the mid 90s as well. Does that sound like a good idea to anyone else or do you think this is a bad idea? Is there a better substitute I should consider?