OEM Toyota plugs will probably last forever but it depends if your gas mileage is like 5 to 10 miles less that's the only way I would change the back plugs.
If you’re buying a used VW. This is the easiest one (Polo) to maintain.
1. Figure their parts change and maintenance schedules and follow. Check oil cap for oil type to use (15-20k is fine).
2. Always check oil hoses, rubber seals and gaskets (40-70k).
3. Change engine bushings (100k), chassis bushings (50k), transmission bushings (100k) for first time used buyer.
4. Check condition of all parts above before change, also include spark plugs. Stick to German OEM plugs (50k).
Spark plugs 100k miles - $25
I replaced the spark plugs, ignition coil plugs, alternator and checked the tensioner.
I have an 02 4runner with 289,500 miles. I've had it for the last 106,000. Replaced the timing belt/ water pump twice. Replaced spark plugs twice. New brakes a few times.
Unfortunately no--replace them. The electrodes wear down and become less efficient. The good news is that iridium plugs have a tremendous lifespan. You're supposed to change them every 100k miles/167k km.
FWIW, I just had spark plugs and coil packs done on my 2016 Jetta, $185 out the door at my local dealership
I had a 2012 Passat I drove for 10 years (after buying used with ~20K miles) and only just replaced two weeks ago with ~125k miles. I had to replace the alternator at one point and some other general stuff like spark plugs over the years, but that was it really. Nothing super expensive.
Bought a 03 100 series with 241,000 only issue was the number 7 spark plug blew out, had to re-tap it and install a aluminum sleeve, and replace the coil
I just came across a recent problem while doing my spark plugs at 80,000 miles. The dealership was the one that did my spark plugs at 40,000 miles. Sure enough, they broke Cylinder 3\u2019s wiring harness connector to the coil pack and stripped the bolt. I had to helicoil the bolt, replace the connector, and repin the connector.
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