Other family members just use dot 3. They don't have any problems.
Looks like I will make the change to this. We have had the master rebuilt 2 years ago.
 
my series 3 has dot 4 in it - although I don't think there is much difference between 3 and 4 other than boiling point - I was told to use dot 4.

so 3 or 4 should do
 
my series 3 has dot 4 in it - although I don't think there is much difference between 3 and 4 other than boiling point - I was told to use dot 4.

so 3 or 4 should do

I have never found there is much difference either. And I am not sure if many regular factors carry DOT3 now, it is getting a bit old fashioned.
 

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