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Can Fully Synthetic and Semi-Synthetic Engine Oils Be Mixed?

1 Answers
LaNaomi
07/30/25 2:08am
Fully synthetic and semi-synthetic engine oils should not be mixed. Semi-synthetic oil is a lubricant formulated from Group III base oils, while fully synthetic oil is produced by chemically decomposing various natural substances and then synthesizing them with other materials. Fully synthetic oil is superior to semi-synthetic oil, offering a longer replacement interval and better engine protection. Hazards of mixing different grades of engine oil: 1. Abnormal exhaust pipe smoke; 2. Accelerated sludge buildup; 3. Reduced sealing performance of piston rods or piston rings, leading to discoloration or damage; 4. Engine malfunctions; 5. Severe wear of pistons and cylinder walls.
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What is the reason why the BMW 5 Series coolant level is too low and it restarts fine?

The reason why the BMW 5 Series coolant level is too low and it restarts fine is due to insufficient coolant in the radiator. Here are the details: 1. Introduction: Coolant is an essential part of a car engine, composed of water, antifreeze, and additives. It circulates in the engine cooling system, carrying away excess heat generated during engine operation to ensure the engine runs at the proper working temperature. In high-temperature conditions, if the concentration and level of the coolant are not within the normal range, it can easily cause engine failure or even overheating. 2. Precautions for using antifreeze: Try to use the same brand of antifreeze. Different brands of antifreeze may have varying production formulas, and mixing them could lead to chemical reactions between multiple additives, rendering them ineffective. Most antifreeze products have a validity period of two years (some products may last longer), so ensure the product is within its validity period when adding it.
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Which BMW Series Comes with the LCD Key?

BMW's LCD key is only available with the new BMW 7 Series. Functions of the LCD key: 1. Remote Control: The key can remotely operate and unlock the vehicle, allowing you to preheat the car in winter or precool it in summer before departure. 2. Vehicle Information: The key's display shows real-time vehicle status, door status, remaining fuel range, unauthorized door opening alerts, abnormal alerts, battery voltage checks, etc. 3. Comfort Access: When equipped with the LCD key, it includes Comfort Access functionality, enabling automatic unlocking and starting when approaching the vehicle, effectively adding a Comfort Access feature. If the vehicle originally has an electric tailgate, it can also sense and operate the electric tailgate.
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There is no difference between Mercedes-Benz with and without 'Mercedes'. Meaning of the name: 'Mercedes' means happiness, signifying that the cars produced by Daimler will bring happiness to their owners. Mercedes-Benz, a German automobile brand, is considered one of the most successful premium car brands in the world, renowned for its perfect technical level, stringent quality standards, innovative capabilities, and a series of classic coupe models. Noble products: Currently, it mainly produces C-Class (mid-range sedans and coupes), E-Class (high-end sedans and coupes), S-Class (luxury sedans and coupes), and G-Class (SUV off-road vehicles).
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What does the yellow exclamation mark light on the Odyssey mean?

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Is the Chery 5x Front-Wheel Drive or Rear-Wheel Drive?

Chery 5x is front-wheel drive. Disadvantages of front-wheel drive vehicles: The disadvantage is that since the main components such as the engine and drive system are concentrated in the front of the vehicle, the rear of the vehicle has less weight distribution, making the rear wheels prone to losing traction and resulting in poorer handling. Additionally, front-wheel drive vehicles inherently have issues with understeer. Moreover, the front axle serves as both the steering axle and the drive axle, leading to complex structure and manufacturing processes, higher production costs, and difficulties in maintenance and repair. Disadvantages of rear-wheel drive vehicles: The drawbacks of rear-wheel drive are also quite evident. The engine power must travel from the driveshaft to the rear axle to drive the rear wheels, which involves a relatively long distance, inevitably resulting in some power loss. Furthermore, components like the driveshaft and rear axle occupy more interior space, leading to issues such as a raised floor in the middle of the cabin.
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Which grade of full synthetic oil is suitable for the 2012 Honda CRV?

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