I specifically mentioned 5.1, not DOT 5.
I have run DOT5 in my other car for over 25 years now, going back to when you couldn't buy it from the retail chains. You could say I'm familiar with the product.<G>
No intention of flushing and converting the Murano for DOT5, I don't plan to keep it that long.
While DOT4 has a higher boiling spec than DOT3, there are a number of brand name products that simply say "exceeds DOT 3 and DOT4" and apparently quite a lot of variation in the products. Shell alone makes about 5 "DOT4" products, only recommends one low viscosity product for ABS systems out of the whole lot.
Which is one reason I'm enquiring. The manuals say very little and ABS apparently has its own requirements.