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apparently there is no DOT 4 Plus "rating", just DOT 4
Yes, but...but there are fluids that are superior to DOT 4. As said above, buy from any European car dealership parts counter or one of the ATE or other European brands. DOT 5.1 is another unofficial rating, and probably the same as 4+. It meets the same performance standard as (silicone) DOT 5, but has the same chemical composition as DOT 4+, similar to DOT 4, close to DOT 3.