Tricky-Ricky Posted June 3, 2010 Share Posted June 3, 2010 For a fairly recent vehicle why do Nissan quote DOT3 fluid when there is 4 and 5.1 available at the time of design and manufacture? for a vehicle with decent brakes as std it seems daft that a better rated fluid is not recommended, i will be using DOT5.1 when i change my hoses. Quote Link to comment Share on other sites More sharing options...
rtbiscuit Posted June 3, 2010 Share Posted June 3, 2010 most manufactures put in the minimum requirement. you only ten dot upgrade if you plan to track it or like a club memeber, prefer the best etc. Quote Link to comment Share on other sites More sharing options...
dcash5 Posted June 3, 2010 Share Posted June 3, 2010 dot3 in america same as dot 4 dot 3 in the UK is like for agricultural vehicles I think dot 4 will be fine dot5.1 is better but needs replacing more often as absorbs water much more easily! Quote Link to comment Share on other sites More sharing options...
rtbiscuit Posted June 3, 2010 Share Posted June 3, 2010 dot5.1 is better but needs replacing more often as absorbs water much more easily! never knew that Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted June 3, 2010 Author Share Posted June 3, 2010 dot3 in america same as dot 4 dot 3 in the UK is like for agricultural vehicles I think dot 4 will be fine dot5.1 is better but needs replacing more often as absorbs water much more easily! I have never seen any information that says DOT 5.1 absorbs water any more readily than DOT3 or 4 as they are all glycol based fluids, the DOT number designates the boiling point of the fluid IE 300f etc, The only different one is DOT5 being silicone in makeup which doesn't absorb water anywhere near as much as glycol. Quote Link to comment Share on other sites More sharing options...
GT4 Zed Posted June 3, 2010 Share Posted June 3, 2010 I have never seen any information that says DOT 5.1 absorbs water any more readily than DOT3 or 4 as they are all glycol based fluids, the DOT number designates the boiling point of the fluid IE 300f etc, The only different one is DOT5 being silicone in makeup which doesn't absorb water anywhere near as much as glycol. Yup Quote Link to comment Share on other sites More sharing options...
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