Alternativa ao óleo mineral Shimano?

Esses dias um amigo veio me perguntar onde arruma óleo mineral pra freio e lembrei disso aqui. Muito tempo atrás um amigo me arrumou um óleo mineral da Citroen q funcionava muito bem nos freios shimano. 

De acordo com a materia, o óleo mineral sai $18 por 50ml, e as alternativas ficam em torno de $15 por 1litro. O shimano é mais de 20x mais caro...

O artigo está em inglês, mas se alguém se dispor a traduzir, ou melhor, descobrir onde vendem esses benditos óleo minerais alternativos é uma boa. Provavelmente uma busca rápida no google já vai resolver o problema. :)

Mineral Oil (http://www.cyclingcentralva.org/geninfo.html)

Mineral oil is a great alternative to DOT Brake fluid. Mineral oil is not caustic 
and is non-toxic, but the main performance advantage to the rider is that mineral 
oil will not absorb water from the air like DOT fluid will. This absorbed water 
causes gas bubbles to form in the system which creates a 'sprongy' feel. While 
researching for a replacement oil to the hyper-expensive SM-DB-OIL Shimano Mineral 
Oil for Disk Brake($18.95 for 50ml., #Y-839 98010)(Red Color), I have found:
Pentosin central hydraulic fluid is one option. Either of LHM Plus or CHF 7.1(No.54106) will work fine. LHM Plus & CHF 7.1 are rated at 18 cSt@40C/6.0 
cSt@100C/VI 340. This is slightly thinner than the Castrol, so it may work even 
better in Shimano brakes. Pentosin is supplied in the hydraulic systems of most 
German and European cars, most notably as BMW and Audi power steering fluid. Consult 
a local dealer about availability. Do not use CHF 11S with as it is a synthetic oil. CHF 7.1 should run about $15 per liter. I think 
that Pentosin CHF 7.1 is probably the best improvement that can be made to the 
Shimano brakes. (Green Color) 
Castrol Hydraulic System Mineral Oil (HSMO) ($13.99, 500ml., Jaguar # JLM-9886 or Castrol # 6582/5966 01) or Castrol Hydraulic System Mineral Oil Plus (HSMO Plus). This mineral oil is used in some 
british cars, like Jaguar and Rolls Royce, in the suspension, and brake assist 
systems. It is not readily available in the US but it can be found at a Jaguar 
dealer parts counter. This oil is rated at 19.8 cSt@40C/6.0 cSt@100C/VI 285. A 
data sheet is available HERE. (Green Color)
It is very important to note that while the above two fluids are used as power 
steering fluids, they are very different than conventional power steering fluids 
or ATFs available in most auto stores. Conventional power steering fluid or ATF 
is almost twice as viscous as these mineral oils and may be incompatible with 
the seals used in the system. Use of other fluids would be a serious mistake.
Magura supplies low viscosity MAGURA Royal Blood and Royal Blue Blood mineral oil. A 16oz. 
container costs $15.00 while a 2oz. container costs $4.00. (Blue Color) (reported 
to be 10wt. but it is probably more like 5-6wt.))
Another option (in an emergency) is to use a suspension fluid such as Motul Fork Oil (Light), RockShox (5w Medium, Hydracoil), Bardahl (5w Fork Oil), Bel-Ray Fork Oil (5wt), or Kayaba KYB (01). These may work fine in a jam. Make sure not to use any synthetic fluids. 
Replace with the proper fluid when you get home. The low viscosity index (VI) 
of these fluids are not suitable for the heat range that the brake system will 
experience. 
DO NOT USE MINERAL OIL FROM THE DRUGSTORE!!!! What you are buying at the drugstore is a laxative, not a specific industrial 
oil. This oil does not have the specific viscosities (up to 3X too thick) or additives 
for perfect functionality with a hydraulic system. A MSDS for drug store mineral 
oil is available HERE. If you were in a jam and just had to use this crap, use Drakeol® 10 or 10B, 
Ultraol 100NF.
This is what Magura says about drugstore mineral oil:

What type of oil should I use in my Magura hydraulic brakes?
Magura Blood mineral oil is the recommended oil, which is a 10 weight mineral 
oil. By far, our most common problem we encounter is consumers putting off-the-shelf 
mineral oil (from a drug store) in their Magura hydraulic brakes. Off-the-shelf 
mineral oil is normally 30-50 weight which will make the brake very sluggish. 
In addition, off-the-shelf mineral oil has additives, perfumes and different boiling 
points, all of which can cause brake failure. USE ONLY MAGURA BLOOD IN YOUR BRAKE 
SYSTEM. Use of any other fluid besides Magura Blood mineral oil will void your 
warranty. (HERE) 
HERE is an article on basic hydraulic system theory. 

Editado por Black Aypim - 26 Dez 2008 as 15:24

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