Hi ,new to this forum but felt I should put this out there.....The only thing you've got to remember guys is that even though your plugs may last 100K they may be close to impossible to remove after that length of time without damaging the plug threads in the head. The factory dosen't put any kind of anti-seize compound on the plug threads and in an aluminum head ,with constant heating and cooling, they can easily seize. So not changing your plugs every 50-60K could be a very expensive "money saver".

 

good thinking, bad man, as they always say...... advise taken.
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KEEGAN

 

I believe you should change out the plugs when the engine is cold. You really don't need to change the plugs yet. They are iradium or platinum. You could just take them out and have a look at them. Google search "spark plug wear" and see pictures of failed spark plugs, then compare. I always like the Bosch Plat + 4's. But, they are expensive. Be very carefull when pulling on the plug connector. You can very easily separate the rubber from the plastic housing. Course, if it does not tear, just put it back on. Also, adda filmof diaelectric grease to rubber components. This will prevent future seize and will make it moisture proof.

As for the oil. I like using the "high" mileage oil myself. I really believe it works. Priced a little higher than standard oil, but way cheaper than synthetic. (I don't use it in my M3 yet. KMs are too low for that right now) But in my wife's wagon I use it.

 

I agree you don't have to replace them at 50-60k but if your taking them out for inspection you might as well. The cost is not that bad, I run the Platinum +4 too and they're less the $40 for all four , I noticed a cleaner running, faster reving engine after I switched out the stock ones at about 65k.It's funny but when I first put them in it ran worse and I almost put the originals back in but after a day or two it started running better than ever. I guess the PCM had to "re-learn" the bestsettings for the new plugs.
The "high" mileage oils are not the same as the synthetics, they're just regular oils with extra additives like seal conditioners etc that older engines might need. A newer engine will get no extra benefits from running a "high" mileage oil. Just my 2 cents.

 

I checked the service manual lately jusy for the spark plug, and also took the engine cover off to see. I have the 2.0L engine, and it has direct ignition, which means the coil is directly mounted on top of the spark plug, there's retaining screw for each coil, no traditional plug wire anymore.

quote from the manual: "Spark plug with an iridium alloy center electrode and platinum tip ground electrode adopted", so I think the plug will go a long way.
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