Results from 100,000 maintenance

[YarisSedan]

I would still change the spark plugs at 100k even if they look like they have a tiny bit of life left. I dont like leaving plugs in for excessive milage as they have a chance of seizing up in the cylinder head.

[gid]

Originally Posted by YarisSedan

I would still change the spark plugs at 100k even if they look like they have a tiny bit of life left. I dont like leaving plugs in for excessive milage as they have a chance of seizing up in the cylinder head.

even if they are iridium , you'll get deposits on the tips from additives , motor oil ( blow by past rings ) , etc.. They will wear and gap becomes larger making for pour firing . These conditions will decrease power and mileage . Had them change the iridium sparks in the 2000 Chevy PRIZM ( Corolla ) at around 90,000 miles and there was a noticeable increase in mileage and pickup . They do say 120,000 mile change , but that's stretching it a bit in my opinion .

[Nigal]

Originally Posted by gid

even if they are iridium , you'll get deposits on the tips from additives , motor oil ( blow by past rings ) , etc.. They will wear and gap becomes larger making for pour firing . These conditions will decrease power and mileage . Had them change the iridium sparks in the 2000 Chevy PRIZM ( Corolla ) at around 90,000 miles and there was a noticeable increase in mileage and pickup . They do say 120,000 mile change , but that's stretching it a bit in my opinion .

The plugs did get changed. I forgot to add that to the list.