2014 GC DOT 5.1 Brake Fluid
I have a question concerning Brake fluid on a 2014 Grand Cherokee 4x4 V8 with the HD brakes. I am asking this question for a friend of mine that is soon going to be towing at the 7200 lb limit in very harsh mountainous areas. He is at around 60,000 miles and doing brake pads and going to also bleed the brakes while changing pads and replace the brake fluid with the best available.
The owners manual calls for DOT 3 or 4 brake fluid. DOT 3, DOT 4 and DOT 5.1 are all polyethylene glycol-based fluid with DOT 5.1 having the highest boiling point followed by DOT 4 and DOT 3 with the lowest. DOT 5 is a different type of fluid that is silicone based and more geared towards racing and does not mix with DOT 3, DOT 4 or DOT 5.1. DOT 3, DOT 4 and DOT 5.1 can be mixed together. DOT 5.1 does meet the mopar requested SAE J 1703 spec and in addition the SAE J 1704 spec. DOT 5.1 increases the dry boiling point 100 F degrees and the wet boiling point 72 F degrees over DOT 3.
So even though the owners manual does not specifically call out DOT 5.1 use, from everything I have found it should be compatible and provide better performance. In the severe conditions he will be operating in the higher boiling points of the DOT 5.1 will be of value to him.
So the question, has anyone used DOT 5.1 brake fluid in their Grand Cherokees? or is anyone aware of any reason why DOT 5.1 would not be good to use in the Grand Cherokee? Thanks, appreciate anyone's thoughts on this.