Understanding Threads

First, we need to understand that most oil filter threads (and most bolts) are "right-handed threads." That is, when we look from above, the thread rotates clockwise to tighten and counterclockwise to loosen.

Why Turn Counterclockwise First?

• Catch the First Thread: Turning counterclockwise first helps us "catch" the first thread of the filter with the engine mount correctly, without skipping a thread or damaging the thread.
• Prevent Cross-Threading: If we start tightening clockwise immediately without the filter being in place, the thread may cross or be damaged. This will cause the filter to not be tight and may cause oil leaks.

Why Tighten Clockwise?

Once the first thread is correctly caught, tightening clockwise is to tighten the filter securely, preventing it from loosening while the engine is running.

Additional Precautions

• Hand-Tighten: The oil filter should be tightened by hand until it is snug enough. There is no need to use tools, as this may over-tighten it and make it difficult to remove next time.
• Check for Leaks: After installation, start the engine and check the filter area for oil leaks. If leaks are found, they should be corrected immediately.

Conclusion

Turning counterclockwise before tightening clockwise is a technique that helps to ensure smooth installation of the oil filter, preventing thread damage and oil leaks, which are important for proper vehicle maintenance.

Additional Advice: If you are unsure about changing the oil filter yourself, consult a qualified mechanic to do it for you.