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30,000 Mile Spark Plug Changes

847 Views 5 Replies 4 Participants Last post by  Hornet Buzz
Since I’m bored while waiting for my Hornet to be built, I decided to see if there was any info about maintenance. After searching my local CDJR dealer servicing page, they have a factory required maintenance guide for the Hornet. (I compared this to three other dealers and the schedule is the same) It mentions having the spark plugs changed every 30k miles. That seems like an awful short interval for modern spark plugs. I did look up info on the Alfa engines and on the 2.0L it’s 60k miles and the 2.9L it’s 30k miles. Thoughts?


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GDI turbo plugs start getting a wide gap much faster than they do in a naturally aspirated engine-

Also a good idea to be meticulous with 3000 mile full synthetic oil changes, regardless of dealer recommendations...
I usually follow the "extreme duty" guidelines in the user manual, but I've never seen on that suggested 3K miles, usually 5K is extreme duty interval which is already short compared to today's 10K interval changes.
$151 to replace spark plugs? This is a inline four, only four plugs and usually super easy to get to. Plugs themselves are probably $30 or so. Also no way that an air filters is $56. Maybe $15.
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