brake fluid for 2004 3500 dually

[mgerald]

brake fluid for 2004 3500 dually

 

[AH64ID]

https://www.mopar.com/en-us/my-vehicle/vehicle-information.html?redirect=om

 

[Darkbloodmon]

I'm trying out this Bosh ESI 6 fluid I flushed my system with before my Texas trip. DOT 3, 4, and 5.1 compatible. DOT 3 is the factory spec from memory.

 

[Ozymandias]

DOT3 from factory, I'm running now DOT4 for the last then years or so and going to BOSCH in two weeks.

 

[JR]

Interesting they claim 100% longer service intervals compared to DOT3 and 50% longer service intervals compared to DOT4. Based on the service recommendations from various auto manufacturers that utilize 3 & 4 the opposite seems to be true.

 

[Ozymandias]

You have to know that in Europe the service intervals for DOT-4 is 2 years.
Probably that's the view from Bosch.

DOT-3 is stoneage , I wouldn't put that old sauce in my lawnmower.

 

[JR]

Correct, which would put DOT3 at 1 year intervals. Kinda hard to believe.

DOT4 does have a higher boiling point but the wet boiling point falls off much faster with age. Hence the short service interval requirements of DOT4. Every manufacture that I have seen publish a service interval for DOT3 is in the 4 year range give or take. It is less dependent on regular changes. If left un serviced tests have shown that DOT4's wet boiling point actually surpasses that of DOT3 (lower).

 

[User113]

brake fluid for 2004 3500 dually

Dodge really cracks me up on this. The 2004 owners manual actually states:

Mopar® DOT 3 and SAE J1703 should be used. If DOT 3 brake fluid is not
available, then DOT 4 is acceptable. Use only recommended brake fluids.
​

The 2004 service manual repeats the sentiment. But, many of the brake fluids available now are dual certified, DOT 3/4. Only Dodge would prefer DOT 3 over DOT 4. Must be expecting you to leave it in for a long time!

 

[AH64ID]

DOT 3 absorbs less water than DOT 4, and if the system is sized correctly the higher boiling point shouldn’t be a factor. You are doing something wrong if you get DOT 3 close to it’s boiling point on these trucks.

I’ve never had any issues with DOT 3 and never noticed any difference after a change or felt any degradation, but I do change my fluid more than many I know. Along with PS fluid, brake fluid is one of the most neglected fluids in automobiles.