Can Different Motor Oils Be Mixed?

1 Answers
AdelynFitz
07/29/25 4:05pm
Motor oils should not be mixed. Different brands and grades of motor oils contain various additives tailored to the specific working characteristics and environmental requirements of different engines, resulting in variations in viscosity, anti-wear properties, corrosion resistance, anti-knock performance, and volatility. Mixing them may degrade the oil's performance and even cause damage to the engine. Here are the reasons why motor oils should not be mixed: 1. Mixing new and used oils reduces performance: Used oil contains a significant amount of oxidative substances. When new oil is mixed with used oil, the oxidation rate of the new oil increases, thereby reducing its effectiveness and service life. 2. Mixing oils can cause turbidity: Oils of different brands and grades should not be mixed. Since the chemical additives in oils vary by brand and grade, these additives may sometimes react with each other, reducing lubrication effectiveness and producing acidic or alkaline compounds that accelerate the corrosion of engine components.
Was this review help?
11
2
Share
More Forum Discussions

How many points are deducted at once for failing to yield to a school bus as required while driving a motor vehicle?

Failing to yield to a school bus as required while driving a motor vehicle results in a one-time deduction of six points. Here is more information about point deductions for motor vehicles: 1. Accumulation and Deduction Cycle: The demerit point cycle for traffic violations is generally 12 months, with a total of 12 points. Depending on the severity of the violation, points can be deducted as follows: 12 points, 6 points, 3 points, 2 points, or 1 point. In practice, there are also cases where 0.5 points are deducted. 2. Violations Resulting in a 1-Point Deduction: Failure to carry a vehicle registration or driver's license; vehicle not displaying an annual inspection sticker. 3. Violations Resulting in a 12-Point Deduction: Cutting in line during traffic congestion, occupying the opposite lane, failing to wait in the designated lane at a traffic light, or overloading by less than 20%.
20
5
Share

What Are the Benefits of Vehicle and Vessel Tax for Car Owners?

It raises fiscal funds for local governments and facilitates the management and rational allocation of vehicles and vessels. Below are the relevant details: 1. Vehicle and Vessel Tax: This is a type of property tax levied on vehicles and vessels that are required by law to be registered with public security, transportation, agriculture, fisheries, military, and other administrative departments in China. The tax is calculated based on the type of vehicle or vessel, according to the prescribed tax basis and annual tax standards. Starting from July 1, 2007, car owners are required to pay the vehicle and vessel tax when purchasing compulsory traffic insurance. 2. Local Tax: The vehicle and vessel tax is a local tax, collected and managed by local tax authorities. For motor vehicles, to facilitate taxpayers and save them time and costs, insurance institutions engaged in compulsory traffic insurance business are designated as withholding agents for the vehicle and vessel tax. They collect and remit the tax on behalf of the government when selling compulsory traffic insurance and promptly transfer the tax revenue to the state treasury.
14
0
Share

What lights should be used on highways at night?

Highway driving at night allows the use of high beams, but they should be used appropriately in combination with low beams. Below are the relevant introductions to vehicle lights: 1. Position lights: Since it is nighttime driving, whether on highways or regular roads, position lights must be turned on. Position lights, also known as small lights, when activated, will illuminate the front and rear position lights as well as the rear license plate light. 2. High and low beams: The use of high and low beams during nighttime highway driving is a common area of misunderstanding for many beginners. High beams can be used on highways at night, but they should be used appropriately in combination with low beams. When the distance to the vehicle ahead is significant, exceeding 150 meters, high beams can be used; when the distance to the vehicle ahead decreases, switch back to low beams. 3. Turn signals: Turn signals should be used when changing lanes, overtaking, entering or exiting the highway, and lane changes should only be made after observing that it is safe to do so, to prevent vehicles in the rear or adjacent lanes from reacting in time.
19
5
Share

What is the quick solution for a blocked fuel line in a motorcycle?

Intake valve leakage allows high-pressure mixed gas to rush into the intake tract during compression and power strokes. The solution is to repair the intake valve; exhaust pipe blockage causes poor exhaust. At the exhaust top dead center, valve overlap occurs, allowing some exhaust gas to rush into the intake tract. The solution is to unclog the exhaust pipe. Here are additional details: 1. Spark plug maintenance: The spark plug is a critical component of a motorcycle engine. Normal combustion of the air-fuel mixture is key to proper engine operation. Each engine requires a specific spark plug model, mainly differing in heat range and thread size, so always use the specified type. 2. Precautions: Determine the thread size and electrode length. If the electrode is too short, carbon deposits may form in the threaded portion of the plug hole, potentially damaging the engine; before using a spark plug wrench, carefully hand-thread the spark plug into the cylinder head to prevent damage; use the dedicated onboard tool, the spark plug socket, to tighten the spark plug to the specified torque.
14
2
Share

How Often Should Crown Spark Plugs Be Replaced?

Crown spark plugs use iridium spark plugs, and it is recommended to replace them after driving 60,000 to 80,000 kilometers. Steps for replacing spark plugs: Open the hood, lift the plastic cover of the engine, remove the high-voltage distributor wires, and mark the position of each cylinder to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. When removing them, check for leaves, dust, etc., on the outside and make sure to clean them thoroughly. Place the new spark plug into the spark plug hole, hand-tighten it a few turns, and then use the socket to tighten it further. Reinstall the removed high-voltage distributor wires in the firing order, and then snap the cover back into place. Effects of damaged spark plugs: If the spark plugs are damaged, they can directly cause issues such as electrical leakage in the vehicle's ignition system, increased fuel consumption, and reduced power. The main problem, however, is difficulty in ignition, which affects the normal operation of the vehicle. Severe spark plug erosion, such as scarring at the top, broken or melted electrodes, or burn marks, indicates that the spark plug is damaged and should be replaced.
1
4
Share

How Can Non-Locals Buy a Car in Beijing?

As long as the car is not registered with a Beijing license plate, you can purchase it with just your ID card. If you want to register it with a Beijing license plate, you must have records of paying medical insurance, pension contributions, and taxes in Beijing for three years. Before the 8th of each month, submit a car purchase application on the website or at the district/county government office. After qualifying, participate in the monthly lottery on the 26th. Tips for non-locals buying cars in Beijing are as follows: 1. Do your homework before purchasing: During preparation, identify and note the flaws and disadvantages of the car, then compare it with its competitors. Use the advantages of competing models to highlight the disadvantages of the car you want to buy during the negotiation process in Beijing, achieving the goal of bargaining. Common disadvantages of cars include issues with power, suspension, space, noise insulation, seats, and dashboard materials. 2. Stay interested but composed: Even if you are already interested in the car, don’t show it. If the salesperson senses that you are there to bargain, they may set a higher base price, preventing you from negotiating further.
15
5
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.