Ever heard of incompatibility between DOT4

morrisman1, Aug 31, 11:42am
I was told today by the nissan dealership that only use genuine fluid to replace the stuff in there now (which is genuine) because otherwise it could react. I was under the understanding that all DOT4 is inter compatible but he disagreed. I don't know if he was just trying to sell me the genuine stuff or if he was correct in saying that one brand of DOT4 might react with another brand.

I know silicone stuff is not compatible with standard glycol based but I thought that all DOT4 was able to be mixed. Can anyone shed any light on this subject! I would prefer answers from those with extensive experience in this area thanks.

jason18, Aug 31, 11:56am
I have always mixed em as they have always said compatible with others.

johnf_456, Aug 31, 1:20pm
Always mixed it and never an issue with dot4.

panicky, Aug 31, 3:49pm
The only incompatibility I have heard of is to do with the different colours manufacturers add sometimes making other odd colours when mixed.

guilian, Oct 11, 2:00am
They say that to cover their asses, make them more money, and adds to any defense they have against a warranty claim.

Dot4 is what it needs, Dot4 is what it gets.