New spark plugs, what a difference

[Paulpt]

Following the valuable DIY instructions somewhere in this forum, I've decided to replace the spark plugs, something that was long due (91K miles on a 2001 3.0). What a difference ! I went with the OEM (NGK about $ 15 ea) but the car runs like new. Smooth, starts right away, has more power and I do not hear a tic tic noise I used to hear when at idling RPM's.

The only thing I did that was not mentioned in the tips was spraying a bit of silicone dielectric spray on the connectors to the plugs (no clue the technical name for it, but they are those long rubber things that go into the plug).


I did notice though that when I removed the plastic cover all the components inside where clean as a whistle, not even a hint of dust (even the inside of the cover was super clean). The plugs where 100% free of oil or any fluids, just seemed like rusted, but I think it is simply from regular wear. (see pics). I am happy to see that the engine is still clean at this mileage. Did replace the air filter too and the micro filter (the latter was incredibly dirty).

I wish I would have done this long time ago, maybe at about 65 / 70K miles, and that's why I am posting this, just as a suggestion to those wondering if they should replace the plugs only at 100K. Easy job to do too.

Good luck.

[wpl11972]

Just ordered mine from Bavauto. I have 98500 on mine. Also got a couple of oil filters and brake fluid. Should be in tomorrow. I need to pick up some die electric grease. No tapping noise but sluggish when taking off. Want to use the fuel injector cleaner posted in the forum to.

[Paulpt]

Let me know how it goes with the injector cleaner. I am not questioning the other member's experience, but I have always been a little hesitant of using these type of products.

Please post your results as we are around the same mileage. - Thanks

[Sudesh]

Great job!! I replaced the sprak plugs on my 4.6is at 15k!! and will be doing so at every 15k, probably a little extreme I know; but I like to keep on top of things.

[WhiteWhip]

how hard is it to change the plugs. Im sure there are plenty of articles on here but im lazy.

[fast4d]

replaced the original plugs @ 105k miles. didn't feel anything.

[tonydan1]

Is it really that important to put the die electric grease on the plugs?

[Paulpt]

The electric grease is applied to the thread to make it easier to remove in the future. I think it is important to avoid cracking the plug when you want to remove it causing a bigger problem.

[fast4d]

no. you don't put dialetic (sp?) grease on the thread. that's for the electrical contact points.


you should put anti-seize compound on the threads.

[Aimster]

you know...

advanced auto parts has the same plugs that BMW sells

for $5 a piece

the serials match...