ATF fluid in master cyl?

[beergut]

I dont want to sound like a sissy but there is a lot of drag/pull on my clutch lever and I think it might stem from mineral oil. I will be flushing mine for some fork oil this weekend.

[DSM8]

Originally Posted by zedtours

I assume it has to be non synthetic fork oil?

Actually I am running the syth stuff myself for over 10K miles.

It holds up well, does not degrade due to the heat like the mineral oil does and the performance is still the same.

Just my .02

[rattis]

Do they mix or do you have to bleed out the old stuff first?

[sabink]

I use 5w full synthetic fork oil without any problem. I have also mixed with ATF in location where I cannot get fork oil.

[DSM8]

Originally Posted by rattis

Do they mix or do you have to bleed out the old stuff first?

If you have mineral oil then it is just a good idea to flush and refill.

You can prolly mix diff fork oil if you had too but I would try to keep stuff in the same family. ATF, Mineral, Fork etc etc

[Greenflyfarmer]

Originally Posted by Nailhead

I have: there is a slight bit more drag to the clutch action, if that makes any sense.

Well ok, maybe the very least little bit, I might remember when I first put it in there but I don't notice it now. Hows that?

[Nailhead]

Originally Posted by Greenflyfarmer

Well ok, maybe the very least little bit, I might remember when I first put it in there but I don't notice it now. Hows that?

You got used to it perhaps?

[Greenflyfarmer]

Break in period.

[Bowser]

for those interested, I had to find fluid at the weekend to do a slave cylinder swap (from OEM to Oberon), and couldnt find anywhere selling the right stuff.
So I used LHM hydraulic fluid, which is a mineral oil for hydropneumatic syspension systems, such as on Citroen's, some Merc's, RR, and old BL stuff, exactly the same colour and weight as the stuff already in there and seems to work just fine, and cheap too, I got it for £4 for a liter from Halfords.

[MortimerSickle]

Originally Posted by Bowser

...
So I used LHM hydraulic fluid, which is a mineral oil for hydropneumatic ...

Just be sure to not get fluid intended for the Hydrolastic system used in some BMC/Rover suspension.

It is not mineral oil.

• 49% alcohol
• 49% distilled water
• 1% triethanolamine phosphate
• 1% sodium mercaptobenzothiazole

[Nailhead]

Originally Posted by Bowser

So I used LHM hydraulic fluid, which is a mineral oil for hydropneumatic syspension systems, such as on Citroen's, some Merc's, RR, and old BL stuff...

I have a better chance of finding a meteorite than the fluid you mention...

[AdvRonski]

Originally Posted by DSM8

If you have mineral oil then it is just a good idea to flush and refill.

You can prolly mix diff fork oil if you had too but I would try to keep stuff in the same family. ATF, Mineral, Fork etc etc

It's all mineral oil, just with different additive packages. ATF and fork oil are actually designed to be lubricants, whereas mineral oil from the drug store-
not so much.

[MAXVERT]

Originally Posted by zedtours

I assume it has to be non synthetic fork oil?

I've used synthetic fork oil in my 990, 690 and 300 for years with
great results. The same stuff I use in my forks.

Max