Spark Plug Replacement
AudiWorld Senior Member
Joined: Oct 2005
Posts: 1,647
Likes: 126
If you are leaving them in for more than 20k-25k miles I recommend platinum plugs or other long-life plug over a basic $1.50 copper plug. I'd be surprised if the stock plugs were not platinum. The FR7LDC+ has 'yttrium technology' perhaps better for wear resistance than platinum.
I generally use copper plugs on engines where I expect to have the plugs out for one reason or another every couple of years, 50-100k life is not a factor in those engines. Otherwise I have generally gotten Platinum plugs and I have also avoided side gaps and multi-prong electrodes. Those I feel are more for life beyond 50k miles and I do not like to leave any plug in that long. They get kinda hard to remove, and I doubt I'll ever not be wondering what's up inside that cylinder for more than 50K miles at a stretch.
-Joel.
I generally use copper plugs on engines where I expect to have the plugs out for one reason or another every couple of years, 50-100k life is not a factor in those engines. Otherwise I have generally gotten Platinum plugs and I have also avoided side gaps and multi-prong electrodes. Those I feel are more for life beyond 50k miles and I do not like to leave any plug in that long. They get kinda hard to remove, and I doubt I'll ever not be wondering what's up inside that cylinder for more than 50K miles at a stretch.
-Joel.
Club AutoUnion
Joined: Mar 2000
Posts: 31,629
Likes: 49
From: Fort Collins Colorado
I have been running Denso Iridium in my 98' for the past 10 years and they are great. Idle was much smoother after replacement. I only have 65k miles on the car but my 01' RX-300 came from Lexus with them and I have 105k miles on the car.
Note these plugs seem to have issues with turbo cars but not NA ones. The fact that Toyota/Lexus has chosen to use them says a lot and that I have got so many miles without issues on the RX
Note these plugs seem to have issues with turbo cars but not NA ones. The fact that Toyota/Lexus has chosen to use them says a lot and that I have got so many miles without issues on the RX
Last edited by Reggie; May 6, 2009 at 07:40 AM.
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