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DOT is not just a number it is a direct specification to the minimum dry and wet boiling points of the fluid along with other minimum specification of the particular fluid.
Now yes, you can find higher rated fluids, but they also fall under a higher DOT spec. (i.e. DOT 5)
Side note, do not run regular DOT 5 as it is a silicone based fliud and will give a very spongy peddle as it is compressable. It is not hydroscopic thus will not absorb moisture, but its solely intended for application that very rarely get driven like a high end show car etc... Its to prevernt rusting thus preventing maintance for something that never gets used.
DOT 5.1 is what you want to use if your something with a high boiling point most all your race type fluids fall under DOT 5.1 catagory. All fluids that have a DOT 5.1 rating will have a minimum dry boiling point of 518*f. Again, this is a minimum... Manufactures do make them higher then that but they still fall under the DOT5.1 classification.
If you race, then yes you want to shop by temp specs but you have to watch. A lot DOT5.1 fluids have very fast moisture absorbsion rates thus requiering more frequent change intervals. The best fluid you can by is Castrol SRF (590*f dry and 518*f wet). Even at 3% moisture content it still meet the minimum dry boiling point for a DOT5.1 fluid. No one else even comes close to that. The down fall to that is its EXTREMELY expensicve. It typically runs about $80+ a liter... not cheap...
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