I used it in the Differential on my classic car (Austin Healey Sprite). The gearbox on my car used 20 50 oil. Suggest you check online to see what your gearbox needs.

Hi which oil is most like castrol d40?

Hi, do you mean D140? This is a bit thinner than that.

The objective i am seeking is to keep my blade lubricated on a Khukuri so no air or moist can come in direct contact of the blade

Hi, probably better off with a product like the ACF 50 or Bilt Hamber Dynax UC.

Can you use this in the differential?

Castrol EP90 is a high pressure oil rated to GL-4 standard making it suitable for use in standard/low power axles and differentials. However, high performance and limited slip differentials require a GL-5 rated oil. For axles the GL and the viscosity ratings are important, I would check what is recommended for your diff. Hope this helps

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Classic Castrol 1840B EP90 Gear Oil, 1 Liter

Product ID: 49209910

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Viscosity
90 sae_grade
Brand
Castrol
Vehicle service type
Car Truck
Automotive Fit Type
Universal Fit
Global Trade Identification Number

🔥Excellent Oxidative Stability

⚙️SAE 90 Extreme Pressure Grade

🛡️Superior Anti-Wear Protection

Description

⚙️ Keep your gears running like clockwork — don’t get left behind!

FOAM FREE OPERATION - Advanced anti-foam properties maintain consistent lubrication and prevent gear damage.
UNMATCHED DURABILITY - Superior anti-wear formula extends gear life and reduces costly maintenance downtime.
STABLE UNDER PRESSURE - Extreme pressure SAE 90 rating ensures peak performance even in the toughest conditions.
TRUSTED INDUSTRY STANDARD - Meets API GL4 certification, the benchmark for professional-grade gear oils.
ENGINEERED FOR PRECISION GEARING - Optimized for helical, spur, bevel & worm gears (excludes hypoid) to keep your drivetrain smooth and reliable.

Castrol 1840B EP90 Gear Oil is a premium 1-liter extreme pressure lubricant designed for a wide range of gears including helical, spur, bevel, and worm types. With SAE 90 viscosity, API GL4 certification, superior anti-wear protection, excellent oxidative stability, and anti-foam properties, it ensures reliable, long-lasting gear performance under demanding conditions.

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Classic Castrol 1840B EP90 Gear Oil, 1 Liter

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Manufacturer	Castrol
Brand	Castrol
Model	1840B
Package Dimensions	19 x 11.6 x 6 cm; 979.99 g
Item model number	1840B
Manufacturer part number	1840B
Item Weight	980 g
Viscosity	90 sae_grade