Unfortunately, we do not have viscosity data for Formula mineral oil. But, our Gold hydraulic oil has a viscosity index of 200, which is well above the 98 of viscosity index of Shimano mineral oil. Viscosity Index - The viscosity index, commonly designated VI, is an arbitrary numbering scale that indicates the changes in oil viscosity with changes in temperature. The viscosity index can be classified as follows: * low VI - below 35 * medium VI - 35 to 80 * high VI - 80 to 110 * very high VI - above 110. A high viscosity index indicates small oil viscosity changes with temperature. A low viscosity index indicates high viscosity changes with temperature. Therefore, a fluid that has a high viscosity index can be expected to undergo very little change in viscosity with temperature extremes and is considered to have a stable viscosity. A fluid with a low viscosity index can be expected to undergo a significant change in viscosity as the temperature fluctuates. The less viscosity is changed by temperature, the higher the viscosity index.
I honestly would not worry about viscosity, there’s imperceptible flow in a brake system. A good quality LMH oil from a motor factor works fine. Just don’t ever chance any DoT fluids!
@@dewindoethdwl2798 FYI, viscosity of fluids in cSt@40°C :Comma LHM 19.0, Shimano 8.0, Formula 9.66, Epic bleed solutions gold 8.56. While flow is obviously low I wonder if it could affect piston return in freezing temps.
I think you can since both oils are very similar.Both have a viscosity of about 8.5cSt at 40°C, at 100°C the Shimano stuff is around 2.4cSt and the Gold is around 2.8cSt. Gold quotes a "higher viscosity index" - aka their fluid has a more consistent viscosity over a range of temperatures - but the MTB bros usually want a fluid with as low a viscosity as possible at the operating temperature, so Shimano's stuff actually looks better here. The main thing that's different is that Gold Oil has a (claimed) boiling temperature that is EXTREMELY high - they're claiming 360°C. That's waaay in excess of pretty much any other brake fluid commonly used on bikes or cars: DOT5.1's boiling point is initially 270°C and degrades over time, and mineral oils are typically in the 250-300°C range (Shimano's is about 280°C). Frankly the extra-extra high boiling point of Gold should not matter to you unless you are a top-0.1% rider pushing to the very limits of performance - in the bike world, anything with a boiling point over 200°C is more than plenty.
@@ManeMtb This is what a guy on reddit told me as I asked the same question. I still don't know if I should use the Shimano oil or just buy the original stuff. But there is a video (sadly in italian) on youtube and a guy who uses Juice Lubes mineral oil on his Cura 4s. And that oil is supposed to work with all brakes that use mineral oil, Shimano included. So I suppose we can safely use shimano or any other mineral oil.
Ils ont aussi utiliser de l'huile minéral mais pas de la même marque que formula, je te conseille d'utiliser de lhuile minéral formula, car sinon la garantie saute, tu peut aussi utiliser de l'huile Shimano ou magura, c'est les même juste pas la même couleur
@@dcrescence38 moi j'ai eu de meilleurs resultats en utilisant l'huile de Bleedkit, car c'est moins visqueux. d'ailleurs l'huile mineral est toujours plus facile que le DOT!
@@dcrescence38 The Gold oil is fine to use. I don't even know if Formula would even notice notice in the event of a warranty claim as the gold fluid is very similar colour (clear)
Disposal of the used brake oil? If we are talking about DOT 4 or 5.1 or mineral brake oil, like Shimano red or Magura Royal blood then please dispose of them properly as they are all poisonous and water pollutants. Take them to the local petrol station or car mechanic. Normally they know how to handle used oils. But, if we are talking about our Gold hydraulic oil, then this is a completely different story. It is 100% biodegradable and 100% non-toxic. So you can throw it in nature (your backyard). Bacteria will eat it. No kidding at all. 100% safe for enviroment.
@@bleedkit Ma question était mal formulée. Je voulais plutôt connaitre le mode opératoire pour CHANGER toute l'huile du circuit de freins pour la remplacer par une huile neuve. Merci
Among all the videos this is the best and explained well in detail, well done!
I can’t do it! I’ll never get my shed that clean and full of whispy zen music.
I own a pair of Formula Cura 4 , no one has ever been able to bleed them properly so far, they are a nightmare to work on.
I did mine recently! They’re a pain in the butt! But manage to get them right bleeding them from the caliper up
Seems pretty easy
It is fairly easy. We believe anyone who can ride a bicycle can bleed their brakes.
What is the viscosity of Formula Brake Fluid please?
Unfortunately, we do not have viscosity data for Formula mineral oil.
But, our Gold hydraulic oil has a viscosity index of 200, which is well above the 98 of viscosity index of Shimano mineral oil.
Viscosity Index - The viscosity index, commonly designated VI, is an arbitrary numbering scale that indicates the changes in oil viscosity with changes in temperature. The viscosity index can be classified as follows:
* low VI - below 35
* medium VI - 35 to 80
* high VI - 80 to 110
* very high VI - above 110.
A high viscosity index indicates small oil viscosity changes with temperature. A low viscosity index indicates high viscosity changes with temperature. Therefore, a fluid that has a high viscosity index can be expected to undergo very little change in viscosity with temperature extremes and is considered to have a stable viscosity. A fluid with a low viscosity index can be expected to undergo a significant change in viscosity as the temperature fluctuates. The less viscosity is changed by temperature, the higher the viscosity index.
I honestly would not worry about viscosity, there’s imperceptible flow in a brake system. A good quality LMH oil from a motor factor works fine. Just don’t ever chance any DoT fluids!
@@dewindoethdwl2798 FYI, viscosity of fluids in cSt@40°C :Comma LHM 19.0, Shimano 8.0, Formula 9.66, Epic bleed solutions gold 8.56. While flow is obviously low I wonder if it could affect piston return in freezing temps.
@@bleedkit @dewindoethdwl2798 FYI, viscosity of fluids in cSt@40°C :Comma LHM 19.0, Shimano 8.0, Formula 9.66, Epic bleed solutions gold 8.56.
Can you use Shimano mineral oil with Cura 4 brakes - given that they also use mineral oil?
I think you can since both oils are very similar.Both have a viscosity of about 8.5cSt at 40°C, at 100°C the Shimano stuff is around 2.4cSt and the Gold is around 2.8cSt. Gold quotes a "higher viscosity index" - aka their fluid has a more consistent viscosity over a range of temperatures - but the MTB bros usually want a fluid with as low a viscosity as possible at the operating temperature, so Shimano's stuff actually looks better here.
The main thing that's different is that Gold Oil has a (claimed) boiling temperature that is EXTREMELY high - they're claiming 360°C. That's waaay in excess of pretty much any other brake fluid commonly used on bikes or cars: DOT5.1's boiling point is initially 270°C and degrades over time, and mineral oils are typically in the 250-300°C range (Shimano's is about 280°C). Frankly the extra-extra high boiling point of Gold should not matter to you unless you are a top-0.1% rider pushing to the very limits of performance - in the bike world, anything with a boiling point over 200°C is more than plenty.
@@BoyanGeorgiev666 Thank you for really elaborate reply. Appriciate it 🙏
@@ManeMtb This is what a guy on reddit told me as I asked the same question. I still don't know if I should use the Shimano oil or just buy the original stuff. But there is a video (sadly in italian) on youtube and a guy who uses Juice Lubes mineral oil on his Cura 4s. And that oil is supposed to work with all brakes that use mineral oil, Shimano included. So I suppose we can safely use shimano or any other mineral oil.
And what is the viscosity of this fluid please?
In answer to my own question, viscosity is 8.56 cSt @40 degrees C.
Checl here: ruclips.net/video/rHhuC4mVZBc/видео.html
Bonjour, j'ai des curas mais avec de l'huile minéral, je comprend pas .merci
Ils ont aussi utiliser de l'huile minéral mais pas de la même marque que formula, je te conseille d'utiliser de lhuile minéral formula, car sinon la garantie saute, tu peut aussi utiliser de l'huile Shimano ou magura, c'est les même juste pas la même couleur
@@dcrescence38 moi j'ai eu de meilleurs resultats en utilisant l'huile de Bleedkit, car c'est moins visqueux. d'ailleurs l'huile mineral est toujours plus facile que le DOT!
@@jshemuel oui je fait pareille que toi mais par contre la garantie saute et c'est chiant
@@dcrescence38 The Gold oil is fine to use. I don't even know if Formula would even notice notice in the event of a warranty claim as the gold fluid is very similar colour (clear)
Tuto frôlant la perfection, mais comment élimine-t-on l'huile usagée ???
Disposal of the used brake oil? If we are talking about DOT 4 or 5.1 or mineral brake oil, like Shimano red or Magura Royal blood then please dispose of them properly as they are all poisonous and water pollutants. Take them to the local petrol station or car mechanic. Normally they know how to handle used oils.
But, if we are talking about our Gold hydraulic oil, then this is a completely different story. It is 100% biodegradable and 100% non-toxic. So you can throw it in nature (your backyard). Bacteria will eat it. No kidding at all. 100% safe for enviroment.
@@bleedkit Ma question était mal formulée. Je voulais plutôt connaitre le mode opératoire pour CHANGER toute l'huile du circuit de freins pour la remplacer par une huile neuve. Merci