Would this work for a ktm 690 enduro r?

It will work in the 690R and it would be unlikely to create any problems, HOWEVER.... KTM specs the 10w60 for that engine so in theory they have designed the oil flow for the slightly thicker oil at high temperatures (i.e. the '60' vs the '50' in the designation). Without getting into the technical details, the 10w60 oil has about 30% more viscosity at VERY high temperatures, say 100 degrees C, than the 10w50. If you ride for prolonged periods at high speed, in high temp environments, or at prolonged low speed where the bike is prone to boiling over then it is very likely that paying the extra $5 for the 10w60 as the KTM engineers intended is worth it. If it was my expensive bike I would spend the extra $5 anyway. Here is the link to the same oil in the 10w60 variant: https://www.amazon.com/dp/B00JAHDIBC/ref=psdc_15719391_t2_B001GMAKZ6

Will this work for a 21 Husqvarana fc450?

yes it will i use it on my 2020 husqvarana fc450

For ktm sx250f 2019 I should bay 10w50 or 10w60 ???

Depends on the temp were you are riding and tour riding style. Refer to owners manual

Is this a 4 liter bottle?

I don't think that one is. Most 4 liter have a red picture and a screw top and most sellers indicate 4 liter

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Motorex Cross Power 4T Oil - 10W50-4L. 171-401-400

Product ID: 11247618

Details

Brand
Motorex
Liquid Volume
4 Liters
Package Information
Jug
UPC
604633136442
Vehicle Service Type
Motorcycle

🔥Extreme temp protection

⚙️Fully synthetic PAO & Ester base

🏍️KTM-approved 4-stroke fit

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Description

🏁 Dominate the dirt with KTM’s #1 synthetic oil!

PURE SYNTHETIC POWER - PAO and Ester-based formula delivers superior lubrication and longevity for peak performance.
WET CLUTCH CONFIDENCE - Zero slipping, zero compromises—ensures smooth clutch performance every ride.
KT MS TRUSTED CHOICE - Officially selected by KTM for all their 4-stroke motorcycles—join the elite riders’ club.
RACE READY ENGINE DEFENSE - Engineered for motocross & supercross 4-stroke bikes to conquer the toughest terrains.
UNMATCHED THERMAL STABILITY - Keeps your engine cool and protected even under the most grueling heat and shear conditions.

Motorex Cross Power 4T 10W50 is a fully synthetic, PAO and Ester-based high-performance engine oil designed specifically for motocross and supercross 4-stroke motorcycles. It offers extreme temperature and shear protection, prevents wet clutch slipping, and is officially approved by KTM for all their 4-stroke models, ensuring top-tier engine wear defense under the harshest off-road conditions.

Specifications

ASIN	B001GMAKZ6
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#16,829 in Automotive ( See Top 100 in Automotive ) #212 in Motor Oils
Brand Name	Motorex
Compatible with Vehicle Type	Motorcycle
Container Type	Jug
Customer Reviews	4.8 4.8 out of 5 stars (983)
Global Trade Identification Number	07611197017523
Liquid Volume	4 Liters
Manufacturer	Motorex
Manufacturer Part Number	82.40302
Model Number	82.403020
Size	4 liters
UPC	604633136442
Unit Count	135.3 Fluid Ounces
Viscosity Level	Medium to High

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