That car came new with plugs that said Toyota on them but they looked just like Denso plugs, with the distinctive ‘U’ shaped profile on the ground terminal. They worked just fine and you can get the comparable plugs now very inexpensively. They will last at least 20k miles and still look and work like new. That’s four years at the rate you are driving. How do the cap, rotor and wires look? They will get old and start cracking at some point.