The water pipes of the automobile oil radiator can usually be divided into the following types:

1. Straight pipe: Straight pipe is the most common type of water pipe, which is usually used to connect the oil radiator and the engine cooling system. Straight pipes usually have simple structure and design and are suitable for general cooling systems.

2. Elbow: Elbow is a kind of zigzag water pipe, which is used to connect the angle conversion or connection between different components in the cooling system. Elbow usually has the design of curvature and angle, which can meet the needs of different positions and spaces.

3. T-tube: T-tube is a branch water pipe, which is usually used to connect multiple cooling system components or branch pipes. T-tube has a main pipe and two branch pipes, which can realize the diversion and confluence of coolant and is suitable for complex cooling system design.

4. Y-shaped pipe: Y-shaped pipe is a kind of branched water pipe, which is similar to T-shaped pipe but has more branched pipes. Y-shaped pipes are usually used to connect multiple cooling system components or branch pipes, which can realize more complicated coolant diversion and confluence.

5. Connector: A connector is a component that connects water pipes, which is usually used to connect water pipes with other cooling system components. Joints usually have different interfaces and connection methods, which can realize the connection and fixation of water pipes.

The above are several common types of water pipes for automobile oil radiator, and different types of water pipes are suitable for different cooling system designs and requirements. When selecting the water pipe type, we should comprehensively consider the factors such as the structure, installation location and connection requirements of the vehicle's cooling system, and select the appropriate water pipe type to ensure the normal operation and safety of the cooling system. In case of doubt or uncertainty about how to choose the appropriate water pipe type, it is recommended to consult a professional automobile maintenance technician or manufacturer for more accurate advice and guidance.