I am considering it for keeping my fluid level where it needs to be because my transmission leaks some (has 270k on it) good choice for that? I need it to last as long as possible budget is tight.
Its fine to use it, apparently there is very little variation between any vendor. But for an older AT like yours, Id probably run a D/M fluid with LG red.
Where is it leaking from? If it's the pan gasket, it's not too bad to replace and would give you a chance to change the fluid. I'd probably throw Maxlife in it if it were mine.
Switched my malibu from pennzoil dex III to Supertech Dex VI (with a bottle of LGR) and the shifts have a crisp, confident feel versus dex III. ST is licensed Dex VI and meets the standards (which are strict) so use it with confidence!