Dried up Ferrofluid?

Thank you!
I have a pair of Kef Reference 3-2 speakers...They have ferrofluid cooled speakers.  I will be replacing in the near future.  Is all ferrofluid the same or is there different types?

Is all ferrofluid the same or is there different types?

I would use this one from Parts Express (audio parts specialist) you'll know it'll be good quality.
https://www.parts-express.com/ferrofluid-100ul-general-purpose-for-1-diameter-vc--340-540

Cheers George

Thank you George!  
My tweeters are Kef pn SP1353.
They do contain ferrofluid.
I am going to attempt a R & R.  Seems straight forward.
Great thread!  I never knew you could 'change the oil' in your tweeters!
I also never knew that it could 'go bad'.
Once again the Audiogon helps out a fellow member!

Guess I’m officially a cheapskate. 

I made my own ferrofluid. I have a bag of ferrite cores I bought for making coils. I used a smooth knife sharpening stone and ground the ferrite core into a fine powder. I used 30 wt Mobile 1 synthetic oil. I mixed the powder into 1 ounce of the oil until it was dark like strong coffee. Then I let it sit and settle overnight. The big particles settled to the bottom. Then I poured the clean ferrofluid into a clean glass bottle with a tight cap. I used an inkjet refill kit syringe to inject the fluid into my dome tweets and midranges.

BTW, that was 17 years ago. Mobile 1 is more stable than regular ferrofluid oil; it has heat stabilizers, antioxidants, detergent, in its additive package. Probably time to check my drivers and do a refill. Also, I used contact cleaner to FLUSH OUT the old ferrofluid. Paper tape will not remove all the old gunk.

quincy196 posts03-14-2020 12:44pmThank you George!
My tweeters are Kef pn SP1353.
They do contain ferrofluid.
I am going to attempt a R & R. Seems straight forward.

👍
And if not old enough yet or sounding ok, just like doing preventative maintenance.

I used contact cleaner to FLUSH OUT the old ferrofluid. Paper tape will not remove all the old gunk.

I think even petrol would be fine for the magnet gap, but anything on the voice coil something milder as the coil insulation lacquer needs to be looked after. 

Cheers George