What You Need To Know About 600-Weight Gear Oil

Before choosing gear oil, many asked if they are used in the Chevrolet transmission Gears, vintage Ford & the former 600 W. Also, 600-weight gear oil is best for rear-end and transmission—this 600-weight oil has a minimum viscosity index of 2270.

There are no additives that can attack bronze or brass parts. Besides this, this oil is specially designed to meet Ford’s specifications. This is the correct oil weight, as specified in the Ford manuals. Without it, this gear oil provides maximum transmission and rear-end gear protection. Let’s go to learn more about this gear oil.

600 weight gear oil

About Of 600 Weight Gear Oil:

Model A transmissions, differentials, and steering boxes used 600W oil when first manufactured. It was Henry’s oil weight of the choice, and it certainly did its job, as many models still survive.

Changes in the industry and the technical specifications of 600W original 600W oil have become challenging to find. Many car owners need help finding 600-weight oil for their new cars.

The lubricant was trapped in the gears to prevent oil from leaking from the wheels. In viscosity, it is much like today’s S.A.E., Similar to S.A.E. 50 gear oil but easier on soft metals.

Usually, it’s manufactured from high-quality base stocks to resist oxidation and thermal degradation. Yet, it also can protect against rust and corrosion and offers good film strength. Plus, it also provides exceptional lubricity.

Application Of 600 Weight Gear Oil:

You can use this 600-weight gear oil in all rear end, steering & transmission boxes. The lubricant used in the early days of motoring in the forties was a heavy clinging lubricant known as 600-weight oil.

High-viscosity oils operate at moderate to high speeds and temperatures. And they come for use in enclosed worm gears where heavy loads and slow speeds require high-viscosity oils. Still, it’s also intended for use in all steam motor applications.

This oil is used in coupling and bearing with viscosity grade depending on the operating condition. In steam application, this oil is recommended for superheated steam up to 260°c. Furthermore, you can apply this oil in drip-feed cups and force-feed mechanical lubricating devices.

Without them, you can use it where ready separation from condensate is essential. For example, where exhaust steam is used for process function. The 600-weight gear oil also has good deducibility.


Property600-weight gear oil
Copper Strip Corrosion, 3 h, 100 C, Rating, ASTM D1301B
Density @ 15.6 C, kg/l, ASTM D40520.90
Flash Point, Cleveland Open Cup, °C, ASTM D92282
Kinematic Viscosity @ 100 C, mm2/s, ASTM D44528.0
Kinematic Viscosity @ 40 C, mm2/s, ASTM D445375
Viscosity Index, ASTM D227095
Pour Point, °C, ASTM D97-9

600-Weight Gear Oil Equivalent:

There are not too many equivalent products of 600-weight gear oil. But some products will provide you with similar quality and performance.

The 600w is equivalent to the new 240WT (model A) and should be used in the transmission and rear end on the straight 140 WT pre-WWI V8. They were comparable to S.A.E. 250W.

Let’s see below the equivalent of 600-weight gear oil.

  • Mobil 600W Super Cylinder Oil
  • Phillips 66 Compounded Gear Oil 460
  • Chevron Cylinder Oil W 460
  • Gulf Cylinder Oil 460

SAE 250 Gear Oil:

SAE 250 gear lubricant comes for high horsepower and high torque conditions. Formulated from the highest quality heavy synthetic base oil. Typically, this gear Oil contains a proprietary additives package and extreme-pressure lubricants. Specifically, it also comes for sheer strength and the demands of racing in severe circumstances. This synthetic formulation gives an obstacle cushion between metal surfaces.

Moreover, it can absorb impact by establishing a barrier coating on gear surfaces to protect against wear, scoring, and pitting. If you use this oil, you can get suitable and long-lasting performance for any heavy-duty application. This oil is ideal for racing and performance applications that tolerate the most severe racing condition. Indeed, this oil is best for pulling tractors and trucks because it protects rear differentials during extreme temperatures and heavy loads.

600W Gear Oil

F.A.Q. (Frequently Asked Questions):

Q. What Is Gear Oil?

Gear oil is a lubricant specially formulated for transmissions, differentials, and transfer cases in trucks, cars, and other machinery. Usually, it contains high viscosity and organosulfur compounds.

Some modern automatic transaxles don’t use heavy oil but are lubricated with low-viscosity hydraulic fluid. And they are available under pressure within the automatic transmission. About 20% of the lubricant market is gear oil.

Most lubricants for manual gearboxes contain extreme pressure and anti-wear additives to withstand the sliding action of hypoid gears. Common additives include sulfur-treated organic dithiocarbamate derivatives compounds.

Q. What is the viscosity of 600W oil?

600W is 375 cSt @ 40C(centigrade temperature) viscosity. Somewhere between 460 and 680.

Q. What is the weight of the gear oil?

Gear oil viscosity is as crucial as motor oil; proper weight will prolong transmission life. Oil weight is selected to work best with the components when designing a gearbox or differential. Synchronizer rings are extensively dependent on oil weight. Excessive wear will occur on the synchronizer rings if the oil is too thick or thin.

While designing the gear tooth profile, the weight of the oil is considered. Oil gears too thin for the tooth design can cause metal-to-metal contact, resulting in premature wear. Excessive thickness and excessive drag reduce economy and sap power.

Gear oils are rated as either single-grade or multi-grade oils. A single-grade oil rating is S.A.E. 90, and a multi-grade oil rating is 80W-90. The ’90’ refers to the warm viscosity in these two examples.

80W refers to viscosity when cold; 80w-90 will have a thinner oil than S.A.E. 90 when cold. Most modern transmissions now need multi-grade oil. Nevertheless, some older single-grade oils are specifically designed for use.

Q. Which gear oil is best for the gearbox?

Most modern gearboxes need a GL-4 oil, and separate differentials need a GL-5 oil. Although they take the same form, gear oil viscosity grades are on a different scale than engine oil viscosity grades. Gear oil viscometric is standardized to SAE J306.

Check: Can You Use GL-5 Gear Oil Instead of GL-4?

Final Word:

In short, 600-weight oil provides excellent component protection at high temperatures. It even offers good sealing film between the round rod and gland in steam application. If you use this oil, you can reduce unexpected downtime and component replacement.

Ultimately, it provides excellent resistance to deposit formation at high temperatures. The properties of this gear oil are excellent anti-wear and low friction. Overall, this is all about 600-weight gear oil. We hope you get all of the vital information that you want.

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I am Engr. Z Eusuf Lubricant Specialist, Mechanical Engineer & has been working with engine lubricants for a long time and knows what makes them work best. I can help you find the right oil for your needs, and I have tips on how to keep your engine running at its best.