NKG Iridium Plugs. Toyota uses Iridium spark plugs (Long Life) . I replaced my original after 120,000 KM. NKG IFR5T11 or BKR5EIX-11. If you want something less expensive for peek performance and don't mind the higher services maintenance schedule use the E3 E.48. The E3 uses a copper core and will require replacement around 30,000-40,000 KM for better performance. Remember to change the Wires. If you have a weak spark... replace the coil packs, but watch as their pricy. The only issue I had was one of the coil packs was a little hard to reach and I accidentally cracked a plastic tab. But at 103K... the recommend interval is between 160,000 to 180,00 K for plugs. My 2001 is just over 186,000 KM. I've only run Synthetic. Use a good oil filter - Mobile 1 are rated better then the FRAM that I've been using, however as long as you change the filter on every oil change you should be good. The only Issue's I've had is dirty Mass Air Flow Sensor (takes about 5-10 minutes) to clean and run a bottle or Royal Purple atomiser every season and you should be good. It of course depends on driving conditions and weather. It gets cold here -40C to +38C. No Oil consumption issues yet.... Knock on wood.