Can I use this for my Mountain Bike Disks?

have a look at the link and if it falls in the correct category i do not see why you cannot. Dot 5.1 is a bit overkill. The link is :http://www.epicbleedsolutions.com/blog/5-mistakes-to-avoid-when-bleeding-mountain-bike-brakes/ (disclaimer: always refer to your manufacturer)

what break fluid should i use in my 2014 bmw 320d m sport touring

BMW uses dot 4 brake fluid in BMW 320D's. Any DOT4 brake fluid will be okay, however this particular dot 5.1 fluid is relaively low quality, and many dot 4 fluids outperform it even when old. Contact BMW or use a BMW forum to ensure that you end up with a high quality brake fluid that is applicable to your use case.

Can I use this to replace dot 4 that is currently in my focus mk2?

Yes dot 5.1 can be used with both dot 3 and dot 4 brake fluid so it is fine to mix or use instead.

Comma Dot 5 1 Synthetic Brake And Clutch Fluid 1l

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₨23713

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Description

🚗 Stop on a dime, drive with confidence!

TRUSTED LEGACY BRAND - From a UK pioneer since 1965, delivering premium brake fluid trusted by professionals worldwide.
SEAMLESS COMPATIBILITY - Easily blends with DOT 3 and DOT 4 fluids, making upgrades and maintenance hassle-free.
COST EFFECTIVE EXCELLENCE - Top-tier performance at a fraction of the price of cycle-branded alternatives—brake smarter, not harder.
UNRIVALED HEAT RESISTANCE - Withstands extreme braking heat up to 180°C wet boiling point for consistent stopping power.
ENGINEERED FOR HIGH PERFORMANCE - Specifically formulated for ABS, clutch, and high-performance braking systems to maximize safety.

Comma BF51L 1L DOT 5.1 Synthetic Brake Fluid is a premium, high-temperature brake fluid designed for high-performance vehicles. It offers a minimum wet boiling point of 180°C, ensuring reliable braking under extreme conditions. Compatible with DOT 3 and DOT 4 fluids, it supports ABS, clutch, and braking systems, delivering enhanced safety and performance. Trusted since 1965, Comma provides a cost-effective solution favored by professionals and enthusiasts alike.

Specifications

ASIN	B003BPUSZS
Best Sellers Rank	4,971 in Automotive ( See Top 100 in Automotive ) 5 in Car Brakes 44 in Greases & Lubricants
Brand	Comma
Customer Reviews	4.7 4.7 out of 5 stars (340)
Date First Available	10 Mar. 2010
Guaranteed software updates until	unknown
Item Weight	1.15 kg
Item model number	BF51L
Manufacturer	Comma Oil & Chemicals Ltd.
Manufacturer part number	BF51L
Model	BF51L
Product Dimensions	7.4 x 9 x 23.3 cm; 1.15 kg
Viscosity	DOT5.1

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