: bosch spark plugs



taxicube
03-15-11, 07:50 AM
I have a 06 dts with 98,000 miles,I want to install bosch platinum ir fusion plugs,I've heard do not use them,for some reason there not good for this motor can someone tell the real deal with bosch plugs.Thanks Bob

RippyPartsDept
03-15-11, 08:57 AM
use the OEM (acdelco) plugs ... NorthStar engines are very particular about taking that plug

Superjim
03-15-11, 09:33 AM
You have almost 100,000 miles and almost 5 years on the AC Delco plugs.
That is pretty good service.
They have been tested and validated for the NorthStar by the GM engineers.

Why change to something that "YOU" have to test and validate ?

Just a thought...

Jim

Lev Blekher
03-17-11, 03:11 AM
I have no problem running Bosch Iridium 4 tip plugs in the Stratus, but if I changed the DeVille's plugs I'd get AC DELCO. But hopefully I'll get a platinum, XTS, or CTS V coupe before I reach that mileage ;)

nguyennhatquang
03-24-11, 05:54 PM
i put the Autolite Iridium Xtreme performance in my car, it run pretty well, i can get 28MPG in Hightway, it is unbeliveable..

Mark58
03-24-11, 07:24 PM
i put the Autolite Iridium Xtreme performance in my car, it run pretty well, i can get 28MPG in Hightway, it is unbeliveable..
Is that on your 2000 De ville?
That is normal,,I had 2001 DHS with 100000 miles on original plugs and was getting between 27 to 30 MPG.
On 2007 Performance best I get is 24 MPG

nguyennhatquang
03-24-11, 08:29 PM
yes. It run very cool now. I love it..here is the photo i took when i changed it.
http://i57.photobucket.com/albums/g228/quangty/Cadillac%20DTS/IMG_0162.jpg
http://i57.photobucket.com/albums/g228/quangty/Cadillac%20DTS/IMG_0161.jpg
http://i57.photobucket.com/albums/g228/quangty/Cadillac%20DTS/IMG_0160.jpg
http://i57.photobucket.com/albums/g228/quangty/Cadillac%20DTS/IMG_0163.jpg
http://i57.photobucket.com/albums/g228/quangty/Cadillac%20DTS/IMG_0165.jpg
http://i57.photobucket.com/albums/g228/quangty/Cadillac%20DTS/IMG_0164.jpg
and here is the result
http://i57.photobucket.com/albums/g228/quangty/Cadillac%20DTS/IMG_0173.jpg

mike5514
03-25-11, 09:45 AM
Back when You could only replace gm points with gm points any other kind would not work. As times change things change. delco a great company is now farming out some of their part marking to other companies. For example a 85 distributor module I almost bought at a dealer was made off shore. I believe now that their oil filters are made by champion. I have a feeling that their plugs are made by nkg? I know that some of their fuel injectors are made off shore. MY 97 sls has 136000 mi i purchased it around the 75000 mi mark and i have not replaced plugs or wires. Are the 2011 plugs and wires made by the same people that made the 97s maybe not, will they last 136000 mi on my car, I will never know. I would like to buy us parts and be willing to (test). but they are hard to find. A lot of us companies are making parts off shore. It would be a great thread to get some input from people who have bought non gm parts and their results plus have members who know where parts are made post their findings on this site. mike

RippyPartsDept
03-25-11, 11:08 AM
in my opinion, it doesn't matter who actually makes the plugs when it comes to the N*

if you don't install the acdelco plugs you're just asking for problems - if you don't have any problems w/ non-acdelco plugs then consider yourself lucky

RicktheRealtor
03-26-11, 04:07 PM
I just read an article this morning interviewing a technician who basically said what many of you stated. Don't mess around with different plugs from the OEMs. The heat ranges are sometimes different, which can cause problems. So called gains in fuel mileage and performance are non-existant.

mike5514
03-27-11, 09:56 AM
Did some research on the net and a plug not to use is Bosch. Checked with rock auto and they have ac delco plugs no. 41950 for 5.48 each, seems like a good price. They also list another number for ac delco plugs and Im not sure which ones would be the best. The 41950 is a double platinum plug they have a piece of platinum welded on the ground electrode. Cadillac owners have reported problems with the platinum coming off the ground tip also some have remarked that the plugs they remove have nkg stamped on them. I agree that heat range is important and so is tip length, some mfg. make one type of plug to fit 2 or more applications because of cost I suppose. A large percent of owners (almost all) are happy with the delco plugs. If and when my cadillacs need plugs I will install ac delco. I do have a Question, are the 41950 the correct plugs for both a 97 sls and a 06 dts? Mike

Superjim
03-27-11, 10:55 AM
Did some research on the net and a plug not to use is Bosch. Checked with rock auto and they have ac delco plugs no. 41950 for 5.48 each, seems like a good price. They also list another number for ac delco plugs and Im not sure which ones would be the best. The 41950 is a double platinum plug they have a piece of platinum welded on the ground electrode. Cadillac owners have reported problems with the platinum coming off the ground tip also some have remarked that the plugs they remove have nkg stamped on them. I agree that heat range is important and so is tip length, some mfg. make one type of plug to fit 2 or more applications because of cost I suppose. A large percent of owners (almost all) are happy with the delco plugs. If and when my cadillacs need plugs I will install ac delco.
I do have a Question, are the 41950 the correct plugs for both a 97 sls and a 06 dts? Mike

My owners manual says the correct plugs for a 2006 DTS is 41-987.

Texas Jim

mike5514
03-27-11, 01:56 PM
Thanks Superjim got my 97 book and it gives 41900 for the plugs while rockauto shows 41950 I believe the 950 replaces the 900. So in either case the 97 and 06 plugs are not the same. Mike