Stiff clutch when cold

[Frank Necrosis]

Originally Posted by ZAKU

It is -22 here and I am having the exact same issues. 99% sure the issue is the clutch slave cylinder and the fluid inside it getting too cold.

I've noticed it especially when driving on the highway, the pedal will become rock hard. Meanwhile it will go from stiff to soft and back again when I'm running errands in the city and it has a chance to sit and warm up.

Check this out: http://www.dixcel.co.jp/en/subconten...erature02.html

DOT3 Viscosity (－40℃) under 1500cst
Dot 5.1 Viscosity (－40℃) under 900cst

I've ordered some DOT 5.1 fluid but it is taking FOREVER to get here.





I'm running Amsoil as well and have the exact same issue. Think about it, how would transmission fluid affect the engagement of the clutch?

I am running Redline MT90 in the gear box. Cold weather gear engagement and disengagement seems better. I don't have to fight to get it into reverse.


But as far as the clutch engaging and not engaging, I was pretty sure it was a different issue. It works fine in town, but on the highway, not enough heat builds up and it is stiff as a board.

Thanks for the link. I will probably switch to the cold temp stuff when the weather improves (no heated garage to work in).