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2002 E320
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Discussion Starter #1
Picked up my new NGK 7090 plugs at Advanced Auto yesterday - changing them out next week. 12 plugs for $22. Found an internet coupon Code CCABIN
$10 off for $30 spent. But has to be ordered in the internet site for Advance Auto. But once orderd, it can be picked up at the store , which is what I did.
I might sound cheap, but $10 is $10.
 

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2000 Mercedes-Benz E320 4matic
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Thanks for posting this. I have plugs on my to do list and am going to order these now. This discount makes them only $1.75 per plug!... awesome deal!

Advance also has a 20% off the whole order promotion going on right now too... so if you're ordering bigger items as well the code "P20" might get you even more off than just $10.

- Advance Auto Parts
 

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1999 E55, 2001 E320, 1990 560 SEC, 2004 ML350, 2001 ML55, 1995 S500, 1998 SL500, 2010 E550 Sport zoo
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The money you save on the plugs for the smart DIY'r help pay for a 17mm boot removal tool - use the deal to make the install easier !

You know what they say.... "I picked up the boot removal tool, and for the very first time I finally felt I had turned the tide on the little pesky boots once and for all"... or something like that, at least thats what they say.
 

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That is a good deal, but the 7090 is only single-platinum. Your OEM plugs are double-platinum. Heck, you can get regular copper-core for even cheaper, but is that the point?

The *correct* NGK replacement is 2647.
 

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Discussion Starter #5
Plugs

I made my own boot removal tool after reading the DIY thread. Home Depot and $13 bucks later for a set of Husky wrenches, i have the tool ready to go.

Glad I read the entire thread, and saw that handy piece of advise.
 

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That is a good deal, but the 7090 is only single-platinum. Your OEM plugs are double-platinum. Heck, you can get regular copper-core for even cheaper, but is that the point?

The *correct* NGK replacement is 2647.
Ugh... I swore had read on here a bunch of times that the 7090 was the correct plug. In looking some more... I see that's just the cheap alternative people are getting and posting about. They seem to say the 7090 runs good though, so it's just the life time issue. I wonder if there is a big difference with the double NGK Laser platinum laser? Or is the 2647 just another case of the companies marketing to get more money? I can't imagine that just having the tip laser welded will yield that much more life out of the plug. If longevity was an issue, I'd just go with Iridium 4's and I personally think that's over kill. This car won't get to 100K anyhow in 5 years so I'd be changing the more expensive plugs early.

So the question: is there any science behind it... or just opinions? I realize that it's a very infrequent job,

Do they put a mile rating on plugs? I wonder how many miles people are getting on the 7090's?
 

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2000 Mercedes-Benz E320 4matic
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Sooooo

I haven't even went to pick up my 7090 plugs yet, so I figured I would do the research. I called NGK, Autolite, and Bosch and spoke with a tech. I asked them their opinions on single vs. double platinum plugs and their life expectancy. They all said pretty much the same thing.

Here is what the NGK technician said:
NGK G Power - 7090 (part# BKR5EGP) - Single Platinum Plug
Rated to last for 40,000 miles (although people routinely drive them getting 50K+)

NGK Laser Platinum - 2647 (part# PFR5G-11) - Double Platinum Plug
Rated to last for 100,000 miles (although people drive them and get 120K+)

He said that although people do push the limits of the plugs and the car seems to run perfectly fine; it will affect throttle response, power, and fuel economy when you go over the recommended miles. Even at 80,000 miles some people will start to lose MPG with the 2647 plug, while others are fine through 100K. It depends on how you drive the car, on how well you maintain the car, etc. You might not notice the difference until you change the plugs though.

That said, I'm thinking I should opt for the 2647 plugs. With the discount code CCABIN ($40 off), they will only be like $6.56 per plug, which is a really good deal for these. I go to Advance Auto web site, but alas that quantity is not available. I can only get 2... yikes

edit: Called the local store... they said to just complete the order online to get that discount and they will transfer some from another store for me. YIPPIE
 

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1999 E55, 2001 E320, 1990 560 SEC, 2004 ML350, 2001 ML55, 1995 S500, 1998 SL500, 2010 E550 Sport zoo
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Yes,,

You need the doubles to go out to 100K, and singles go out to 50K.

Next time Amazon is a good place to shop lowest price, on the double Bosch the price is normally like $5.25 and often free shipping.

Good price for local pickup on the double NGK's with the special, I hate paying the 9.5% sales tax in my area though if I can avoid it online and keeep total net cost low.
 

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You need the doubles to go out to 100K, and singles go out to 50K.

Next time Amazon is a good place to shop lowest price, on the double Bosch the price is normally like $5.25 and often free shipping.

Good price for local pickup on the double NGK's with the special, I hate paying the 9.5% sales tax in my area though if I can avoid it online and keeep total net cost low.
Good point. The Bosch 7422 is only $4.12 each on Amazon... $4.47 on Autohausaz. The Amazon charges shipping though so it works out to be a couple bucks cheaper on Autohausaz ($53.64 AZ vs. $55.54 Amazon).

7742 is the correct one right?
 

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1999 E55, 2001 E320, 1990 560 SEC, 2004 ML350, 2001 ML55, 1995 S500, 1998 SL500, 2010 E550 Sport zoo
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Yes Bosch 7742 also known as FR8DPP33 (current version sometimes called +1).

You're in the groove, think about getting the boot tool to pop the pesky boots, and a can of dielectric grease to schmear a little in the boot before you slip them back on.

Keep the beat !
 

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I agree the laser welding is meaningless, the point is the double-platinum electrodes to equate with the OEM plug.
If you're happy with a 40K plug, that's fine, but at that point I'd be more tempted to be happy with a 30K plug and put a non-resistor in. ;)
 

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I just ordered the 7422 plugs. I got them at Rockauto for $3.83 each... $52.09 total shipped (shipping was $6.13).
 

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1999 E55, 2001 E320, 1990 560 SEC, 2004 ML350, 2001 ML55, 1995 S500, 1998 SL500, 2010 E550 Sport zoo
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No mention of the boot removal tool - I guess another non-convert.
 

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1999 E320 Sedan
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No activity lately, but some may be interested. Just purchased 12 Bosch Iridium plugs (9652) on advanceautoparts.com for $7.09 each. Total is $85.08 before discount. Use discount code (RAF7JA1102) to receive $35 discount on $85 or more. In addtion, Bosch is running a $2 per plug rebate for purchases before 12/31/2011.

Bosch Iridium 9652 @ Advance Auto Parts

Bosch Rebate Form
 

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richyoung
I did the same thing. came to about 3 bucks a plug. Good deal for a top-noth plug. this was one of the top threads on saturday, if anyone wants to find it
 
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