I have a rx7 TII, any one know what's the recomended fluid? Can i use dot 5.1 brake fluid on cluth? or this oil is bad for the clutch cylinders?

regards

 

As a general rule you should not mix different types of DOT fluid. DOT 3 is what is recommended for our cars. DOT 5.1 like 3 and 4 is glycol based and should be fine, but I have no experience with it personally.

 

DOT 5.1 is overkill, you don't need that high a boiling point.
Wouldn't hurt anything but there's no need to make a special purchase if you have DOT 3 or 4 handy.

 

I dont think you can mix the dot3 with the 5. I could be wrong!

 

DOT 5 is silicon based and can't be mixed with anything else.

DOT 5.1 is the same as DOT3/4 but with a higher boiling point.

 

what the heck would you need a high boiling point for on clutch hydraulics? They don't get anywhere near the heat of a brake system.

 

To answer your question: Yes, you can use DOT 5.1
The recommended fluid is at least DOT 3

Compatible fluids are polyethylene glycol based, and are DOT 3, DOT 4, and DOT 5.1
You cannot use DOT 5, as it is silicone-based, unless you flush the system and use only DOT 5.

The advantage of a higher DOT rating is a higher boiling point - this is important on brakes, and almost a non issue on our clutch design.
So if you've got 5.1 laying around, sure, you can use it if it saves you a trip to the store, the clutch doesn't take much fluid at all.

Otherwise, just buy some cheap-o fluid that is at least DOT 3, and flush the system once every two years.

 

dummy

use the recommended fluid, the clutch doesn't get that hot that it needs racing fluid.