Is it good for transmission fluid to leak into the engine?

Transmission fluid should not leak into the engine. This is because transmission fluid is designed to lubricate the gears and other components of the transmission. It has properties that are different from engine oil and is not suitable for engine lubrication. If transmission fluid leaks into the engine, it can cause various problems.

For example, because transmission fluid has a higher viscosity than engine oil, it can cause increased wear and tear on the engine's components. It can also cause the engine to run hotter because the thicker fluid makes it harder for heat to dissipate. Additionally, transmission fluid can clog oil filters and passages, which could starve the engine of oil.

If you notice any signs of a transmission fluid leak, it's important to have your vehicle inspected by a qualified mechanic as soon as possible.