Hot draining an oil filter involves draining the filter while it's still warm, ideally near the engine's operating temperature. This ensures more complete oil removal. The EPA defines hot draining as draining the oil filter near engine-operating temperature and above room temperature (above 60°F).
Why Hot Drain?
- Improved Oil Removal: Warmer oil is less viscous, allowing it to flow more easily and completely out of the filter. This results in less residual oil remaining in the filter.
- Faster Draining: The reduced viscosity of warm oil leads to quicker draining times.
Methods of Hot Draining
While several methods exist, they all share the common element of removing the filter from a warm engine. The specifics of post-removal handling vary, however, all methods aim for consistent temperatures above 60°F during draining. One common method involves:
- Warm-up: Run the engine until it reaches normal operating temperature. This allows the oil to adequately heat up.
- Filter Removal: Carefully remove the oil filter using the appropriate tools. Always ensure the engine is off and the oil is not excessively hot to prevent burns.
- Controlled Drainage: Place the used oil filter in a designated container to allow the oil to drain. Maintain the ambient temperature above 60°F to facilitate complete draining. Puncturing the filter's anti-drain back valve or the filter dome end can accelerate this process.
Important Considerations
- Safety: Always wear appropriate personal protective equipment (PPE), such as gloves, to prevent contact with hot oil and used oil.
- Disposal: Properly dispose of used oil and filters according to local regulations. Many auto parts stores and recycling centers accept used oil and filters.
