Can I make spark plugs last longer?
Yes, you can!

As with most other engine components, proper care and maintenance can prevent problems such as vehicle engine misfires, damaged pencil coil ignition, or carbon buildup. Routine maintenance also helps extend the life of the internal combustion engine.

Here are some things you can do to maximize spark plug shelf life:

Choose the correct spark plug. When buying new spark plugs, stick to the ones recommended in the owner’s manual. If your manual doesn’t mention it, consult a mechanic when upgrading to long life spark plugs.
Check the electrode tips regularly to make sure they are clean. Check to make sure that the center and ground electrodes are not rusted.
Make sure your spark plug wires and porcelain insulators are coated with a dielectric compound. This prevents problems such as premature corrosion and carbon deposits from penetrating the insulator.
Maintain the spark plug gap. If they are too close together, they can damage the old spark plugs and cause the engine to misfire. If it’s too far, the plug may not spark at all. It is best to refer to your owner’s manual for proper clearance.
Clean the installation area regularly. The buildup of dust and dirt can sometimes dislocate the spark plug.
Most importantly, make sure your mechanic is looking at any old spark plugs within the recommended mileage. A faulty spark plug or even a damaged spark plug wiring can cause unnecessary problems with your engine.
Beyond that, be sure to check your new spark plugs, and consider investing in longer-life spark plugs.

If you are new to this, have your mechanic handle maintenance and repairs. Improper handling of spark plugs in ignition coil factories can affect fuel consumption and internal combustion engine performance.