What would you say the average life expectancy of a DOT4 fluid is for the clutch system?

 

It really doesn't matter. It should be a lifetime fluid.

The reason brake fluids need to be changed is because all brake fluid is hygroscopic, meaning it absorbs water. If you look around, you'll find brake fluids are rating by dry and wet boiling points. Dry is the boiling point of the fluid right out of the bottle, and wet is when its absorbed a bunch of water. So, brake fluid needs to be changed periodically to maintain a higher boiling point, especially if you go to the track or drive like a maniac where you might actually bring your fluid up to high temperatures.

However, unless you're repeatedly doing clutch dumps, your clutch fluid won't see a fraction of the temperature that your brake system sees. As long as the fluid doesn't boil, you shouldn't have any issues.

 

Thanks stealthx32

 

I put Motul RBF 600(racing) which exceeds all dot as it 'boils' in a much higher temperature than dot 3 dot4 and dot5. Think that could be a problem?

 

[QUOTE=stealthx32,Aug 2 2006, 09:20 AM] It really doesn't matter.

 

OEM honda isnt a bad option either. changing the fluid once a year keeps all the seals happy as well.