Let Me Know if You Have Allison Transmission Fluid Questions

If you're only operating for 4000 miles or so per year, you'd be able to run TranSynd out past the calendar year restrictions. However, you should use oil analysis to verify it. Not just because I now do oil and coolant analysis, but because it's the only way to ensure that the fluid remains stable (from an oxidation, shear, and contaminants standpoint) and that the transmission wear metals are OK.

Hope this helps !!!