I have a 2010 ES350 with 150k miles on it (a good portion of which is highway mileage). As far as I know, the spark plugs have never been touched and the engine does not burn oil.
I've seen forums filled with people changing their iridium spark plugs at 150-200k miles as preventative maintenance and finding them to be in great shape.
So my question is, should I change the spark plugs as a precaution, or leave them be if they are unlikely to ever fail?
checking them isn't a bad idea
I will during my next oil change, but doesn't resolve the issue. If they're beaten, then definitely will change them, but does that mean if they look fine I should leave them alone?
if they look really good (not too fouled, tips aren't eroded and gapped correctly. porcelain isn't cracked. engine runs fine) I don't see why they wouldn't keep working. Depends on the cost too.
Yea, would cost about $100 for the spark plugs, not to mention the time of getting to all of them. Since the car runs fine, I suppose I'll just leave them alone assuming they look fine when I check them. Thank you!
If they're beaten, then definitely will change them, but does that mean if they look fine I should leave them alone?
If you're going to take the time to inspecting each plug, why not just replace them while your there..
Each spark plug costs around $12-13 and there would be 6 to replace. Not only that, but I wouldn't check them all, I'd only check a couple that are easily accessible, the rest will likely be in similar condition
No question that iridium plugs can last a very long time. https://imgur.com/mLhcWi9