How Much Engine Oil Do Electric Vehicles Really Use?

Electric vehicles (EVs) are often viewed as a clean alternative to traditional internal combustion engine (ICE) vehicles, but even they require some form of lubrication. Let's dive into the specifics of how much motor oil and other lubricants are used in EVs and under what circumstances.

Understanding the Role of Oil in EVs

Unlike ICE vehicles, which rely on engine oil for the operation of moving parts like the engine, pistons, and valves, electric vehicles primarily use lubricants in the form of gear oil and grease in various components such as wheels, axles, gears, steering, and suspension. Gear oil is used in the reduction gearbox, and other small amounts are used in sealed bearings and door hinges.

How Often Do You Need to Change the Oil?

For the most part, the oil in an EV will not need to be changed frequently, as it is not exposed to the high temperatures and combustion products present in ICE vehicles. This means that for an extended period, you may never need to add or replace oil beyond a few qts. to compensate for any minor losses due to leaks or the replacement of old parts.

For instance, if the differential in an EV leaks, a liter or two of oil is sufficient to refill it. Similarly, an ounce or two of oil is enough to lubricate a new suspension part, and in most cases, these parts are pre-lubricated for their entire lifetime. Therefore, unless there is a leak or a part is failing, the oil in an EV can last for years without needing to be changed.

Specific Details and Examples

Let's take a specific example: in a gearbox, the oil used is similar to that in a traditional differential but is changed less frequently. Motor oil for EVs, especially in the gearbox, is usually petroleum-based. This type of oil is changed every 100,000 miles, which is significantly less frequent than the typical 5,000 to 10,000-mile service interval for a regular car.

Conclusion

In summary, electric vehicles come equipped with the oil they need for years of use. The oil they use is primarily in the form of gear oil in the reduction gearbox and small amounts in other critical components. With proper maintenance, electric cars can go for long periods without needing oil changes or additions. So, if you're considering an EV, rest assured that the oil maintenance aspect is relatively manageable and infrequent.