Which fluid may be mixed with engine oil for recycling?

Used engine oil can be mixed with other compatible automotive fluids for recycling purposes. Typically, the fluids that may be mixed with engine oil for recycling include:

1. Transmission Fluid: Used automatic transmission fluid (ATF) can often be mixed with engine oil for recycling, as both are petroleum-based.

2. Hydraulic Fluid: Used hydraulic fluids, which are also petroleum-based, can sometimes be mixed with engine oil.

3. Gear Oil: Like engine oil, gear oil is a lubricant and can be mixed for recycling.

It's important to note that not all recycling centers accept mixed fluids, and some may have specific guidelines or restrictions. Always check with your local recycling facility to ensure compliance with their requirements.