Correct. While there are certain brands of DOT4 and DOT4LV that claim to absorb less moisture (and last longer), a blanket statement should not be made.I think you got that backwards, dot 3 absorbs moisture slower, and is less expensive. This is why non-performance cars tend to use Dot 3.
There are additives for corrosion. You could assume name brands have effective additives, that can be wrong.
There are also low viscosity fluids in both Dot 3 and Dot 4, I do not know if they absorb quicker or slower.
DOT4 is higher performance (boiling point) than DOT3, but it also deteriorates faster since it absorbs water more readily. Past a certain water content, DOT4 will become lower performance than DOT3. For the average daily driver, I would say stick with DOT3 unless you're going to be religiously flushing it out every 2 years.
DOT 3 is fine and that's all I use and if that is what your manufacturer recommends, you will be fine.. Going to Pike's Peak often, I might want DOT 4.There's a temperature difference between DOT3 and DOT4, but would there be any harm for any grandpa type of driving to use DOT3 instead of DOT4?
Thanks for the help.
Any thoughts on the valvoline “synthetic” dot 3&4 fluid? I’ve been using it for years and it’s always been fine but I can’t seem to find any actual specs on it now. Just their separate dot 3 and dot 4 fluids.
Almost all manufacturers use DOT4LV in their higher performance vehicles or their all models (BMW, VW, etc.). Reason is better ESP operation at lower temperatures. However, LV fluids should not be used on track and similar environment ever.There are two types of DOT 4 brake fluid DOT 4 and DOT 4LV. LV is low viscosity. DOT 4LV has been/is used in many new Ford vehicle's, every F150 included. Euro makes also switched to DOT 4LV.
Almost all manufacturers use DOT4LV in their higher performance vehicles or their all models (BMW, VW, etc.). Reason is better ESP operation at lower temperatures. However, LV fluids should not be used on track and similar environment ever.