BRAKE FLUID / which one ?

[DoubleT-PS]

Need to add some more brake fluid. The resavoir that states Use DOT 2 brake fluid is low.
Went down to parts store and guy is telling me they no longer stock this DOT2 fluid because of its "low grade." Does he know what he's talking about ?
If DOT 2 is so low grade, why the heck does Ford recomend it for a heavy Superduty massive weight diesel truck?
Can I use something different in that DOT2 resavoir ? Any safe recomendations ? Heck should I use the heaviest brake fluid in both resavoirs ?

[19558077]

DOT 3 IS FINE.

[stockcar12]

dot 3 or dot 4 is just fine just dont use dot 5 it has silicon and will mess up your whole system good luck!