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spark plug mileage
- Thread starter irvin48
- Start date
ARtraveler
R.I.P. Dwayne
When I had my 2014 serviced at 33,000, the dealer said they should last 60K.
PMK
Active member
Modern spark plugs typically show minimal physical wear, the internal resistors begin the fail and will cause the coils to require greater effort to fire the plug. This added resistance can cause issues where the coils will have the insulation between windings or insulation to ground breakdown and cause misfires. At that point the coil is pretty much scrap.
When I replace spark plugs in my Tacoma, they look brand new. For the $15 the plugs cost and the minimal time to swap them it is not even a question for me when to replace spark plugs. On the aircraft, the spark plugs are about $75 each. These are iridium fine wire plugs. Typical massive electrode plugs have short lives and worn electrodes, but seldom have resistors fail. The fine wire iridium plugs show no wear, last about 4 times longer, and cost about 4 3 times more than conventional massive electrode plugs. Ultimately saving money over the long run. Once one plug starts to fail, they all fail shortly thereafter.
When I replace spark plugs in my Tacoma, they look brand new. For the $15 the plugs cost and the minimal time to swap them it is not even a question for me when to replace spark plugs. On the aircraft, the spark plugs are about $75 each. These are iridium fine wire plugs. Typical massive electrode plugs have short lives and worn electrodes, but seldom have resistors fail. The fine wire iridium plugs show no wear, last about 4 times longer, and cost about 4 3 times more than conventional massive electrode plugs. Ultimately saving money over the long run. Once one plug starts to fail, they all fail shortly thereafter.
PMK
Active member
FWIW, each ignition coil is pretty reasonable at MSRP. So, certainly, run the plugs further than recommended. Worse case when swapping to new spark plugs, you can replace the three coils at the same time. If you are paying a shop to do the work you should be money head swapping plugs and coils at the same time if you go well beyond the recommended replacement intervals.
KX5062
Active member
I replaced mine on my 2014 RT at about 35k miles and they were visibly worn. From my single observation, I'd say between 32k to 35k miles and no more. In theory they should last a lot longer, but some engines are harder on plugs than others.
(For example, BMW boxer engines need a plug change at 12k miles, using a standard spark plug. Which again, in theory is an overly short interval.)
(For example, BMW boxer engines need a plug change at 12k miles, using a standard spark plug. Which again, in theory is an overly short interval.)
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