Product details
Castrol B373 Gear Oil 1L: Where Racing Performance Meets Rock-Solid Reliability
If you’re on the hunt for a gear oil that can really take a beating in competition vehicles, the Castrol B373 is definitely worth your attention. This mineral-based racing gear oil is specially crafted to perform brilliantly with limited slip final drives. So, if your motor needs that extra grip and silky-smooth gear shifts out on the track, this might just be your new best mate. It’s all about marrying limited slip performance with serious load-bearing muscle, meaning your gears get the protection they deserve when the pressure’s on.
Why Opt for Castrol B373 Gear Oil?
Well, to start with, it’s mineral-based – which some racers swear by for certain setups because it strikes a cracking balance between protection and cost. The SAE 90 viscosity means it’s thick enough to shield your gears under heavy loads without turning your gear changes into a sluggish chore. On top of that, the extreme pressure additives mean it’s ready and willing to carry hefty loads and slash wear. After all, nobody fancies their gearbox packing up halfway through a race, right?
Who’s It For?
If you’re running limited slip differentials in your competition or race cars, this oil will be right up your street. It keeps your gear components well-lubricated and guarded, helping to dodge those annoying gear whines and premature wear. Perfect for anyone who’s constantly pushing their vehicle to the limit and wants something tough that won’t mess around with complicated setups.
A Bit of Technical Nitty-Gritty
It comes in a handy 1-litre bottle, tipping the scales at just under a kilogram, so it’s easy enough to handle when topping up or swapping out your oil. The dimensions (6.5 x 9.5 x 24 cm) mean it won’t hog space in your garage or workshop. And it’s made by Castrol – a proper stalwart in automotive lubricants – so you can bet your boots it’s up to scratch.
Tips and Things to Bear in Mind
Remember, this is a specialised racing gear oil. If you’re tempted to chuck it in your everyday road car, have a butcher’s at your vehicle’s specs first. Also, it’s worth checking the manufacturer’s website for the Material Safety Data Sheet (MSDS) to make sure you’re handling and disposing of it properly. Better safe than sorry, as they say!
So, if you want a reliable, performance-driven gear oil that’s built to give your limited slip final drives the care and protection they need when the stakes are high, the Castrol B373 Gear Oil SAE 90 1L is a top-notch choice. No faffing about with subpar oils – just solid, dependable performance when it really counts.

