can i fill this oil for unicorn bike disk brakes?

Unicorn doesn't make brakes, they do frames. Look at your brakes. If they are Shimano and say "Shimano Mineral Oil" on the reservoir housing at the lever, then that's what they use.

What is the safest thing to do with old used oil?

Don't pour it down the drain of flush it. It is non-toxic mineral oil so you could treat it like old olive oil I guess. Or bacon grease. If you ever burn leaves or wood scraps you could burn it. Good question.

What is the volume of oil in this product? Yet another Amazon listing without relevant details!

The description says 1000 cc (cubic centimeters), which is approximately one quart.

May i apply it to my bicycle chain?

I would not use this product as a chain lube. I would recommend a product like Rock and Roll Gold Standard Chain Lubricant. Pedros and Finish Line also make chain specific lubricants.

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Shimano Mineral Oil | bike-oils

Product ID: 1840590

Details

Brand
SHIMANO
Item Weight
907 Grams
Liquid Volume
1000
Material
Plastic
Package Information
Bottle

🌿Eco-friendly, non-toxic, water-resistant formula

🔥Advanced heat expansion for consistent braking

🛑Non-corrosive mineral oil for brake longevity

€ 43.48

Duties & taxes included

In stock

Sold byAmazon IrelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Upgrade your ride’s stopping power with Shimano’s mineral oil — because every second counts!

ECO CONSCIOUS FORMULA - Ride clean with a non-toxic, environmentally friendly brake fluid.
UNIVERSAL COMPATIBILITY - Perfectly pairs with all Shimano hydraulic disc brake systems across MTB, road, and gravel bikes.
HEAT RESISTANT PERFORMANCE - Engineered to maintain brake consistency even under intense heat stress.
MAINTENANCE MADE EFFORTLESS - Water-resistant properties reduce brake failure risk and simplify your tune-ups.
UNMATCHED BRAKE RELIABILITY - Keep your stopping power razor-sharp on every descent and sprint.

Shimano Mineral Oil is a premium 1-liter hydraulic disc brake fluid designed for optimal brake performance and durability. Its non-corrosive, eco-friendly formula resists water absorption, ensuring consistent braking power even during prolonged, high-heat rides. Compatible with all Shimano hydraulic disc brake systems, this mineral oil simplifies maintenance while delivering reliable stopping power for mountain, road, and gravel cyclists.

Specifications

ASIN	B001E4MH84
Best Sellers Rank	#12,113 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #1,940 in Cycling Equipment
Brand Name	SHIMANO
Container Type	Bottle
Customer Reviews	4.8 4.8 out of 5 stars (2,060)
Flash Point	80 Degrees Celsius
Included Components	Mineral Oil
Item Form	Liquid
Item Type Name	Oil
Item Weight	907 Grams
Liquid Volume	1000 Milliliters
Manufacturer	Shimano
Material	Plastic
Model Number	SM-DB-OIL
Number of Items	1
Part Number	SM-DB-OIL
Recommended Uses For Product	Lubricate disc brake systems Shimano
SAE J300 Viscosity Grade	30
Specific Uses For Product	Lubricate Shimano disc brake systems, Maintain performance in varying riding conditions, time, temperature and heat generated in the system
UPC	750022902362 022255354042
Unit Count	33.814 Fluid Ounces

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