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post #1 of 14 Old 19th February 2019, 12:07 AM Thread Starter
chadjones99
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Spark Plugs & replacements

So doing a search on a popular online auto parts store that has a " Rock and a auto " in its name . found a list of plugs that are listed for our cars ( V10 S85 ) as :AUTOLITE XP5701 Iridium-Enhanced . Along with the NGK 4471 so the autolite is listed as a higher tier than NGK and I know most people use NGK,s on these cars so has anyone used the autolite replacements ?
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post #2 of 14 Old 19th February 2019, 01:40 PM
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Originally Posted by chadjones99 View Post
So doing a search on a popular online auto parts store that has a " Rock and a auto " in its name . found a list of plugs that are listed for our cars ( V10 S85 ) as :AUTOLITE XP5701 Iridium-Enhanced . Along with the NGK 4471 so the autolite is listed as a higher tier than NGK and I know most people use NGK,s on these cars so has anyone used the autolite replacements ?
Stick with the OEM NGK, amazon has them pretty cheap

2008 BMW M5 E60 Current DD
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post #3 of 14 Old 19th February 2019, 03:13 PM
ctek
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FCP Euro has lifetime warranty for most (if not all) parts, Id suggest ordering from there.


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post #4 of 14 Old 19th February 2019, 04:08 PM
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You drive an m5 and "shopping around"/experimenting with aftermarket spark plugs?
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post #5 of 14 Old 20th February 2019, 05:08 AM Thread Starter
chadjones99
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You drive an m5 and "shopping around"/experimenting with aftermarket spark plugs?

Yes , these are not cheap plugs and nor is the other ones I was looking at (AUTOLITE ), just because its a M5 doesn't mean only 1 part in the world will fit it. does everyone by OEM BMW tires the whole time what about OEM BMW oil filter maybe a lot of people but not all. so why would plugs be so special. Just asking maybe someone has had great luck with another plug ?
FYI I also just had ACL rod bearings put in not BMW

Last edited by chadjones99; 20th February 2019 at 05:10 AM.
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post #6 of 14 Old 20th February 2019, 09:41 AM
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Originally Posted by chadjones99 View Post
Yes , these are not cheap plugs and nor is the other ones I was looking at (AUTOLITE ), just because its a M5 doesn't mean only 1 part in the world will fit it. does everyone by OEM BMW tires the whole time what about OEM BMW oil filter maybe a lot of people but not all. so why would plugs be so special. Just asking maybe someone has had great luck with another plug ?
FYI I also just had ACL rod bearings put in not BMW
I'm using them now in mine for the pass 3k miles and on a tuned engine, I don't notice any difference, I can't remember the make but will post later when I get back from work.
I think with the platinum and iridium plugs it's just harder material I don't know if there's a performance or running gain as again it feels the same to me. I only brought them as they were going for the same price as the platinum plugs.

So your choice mate your car


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post #7 of 14 Old 20th February 2019, 09:45 AM
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OEM spark plugs works as should with ionic sensor, other plugs may not work properly with those sensors. Only for that reason I wouldn't put anything else but OEM plugs.

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post #8 of 14 Old 20th February 2019, 01:43 PM
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If you get them from amazon, or anywhere online for that matter, be sure to check to be sure the plugs are all the same before you start. I didn't and paid the price when I found 2 of the plugs amazon shipped me were incorrect.
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post #9 of 14 Old 20th February 2019, 02:54 PM
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OEM spark plugs works as should with ionic sensor, other plugs may not work properly with those sensors. Only for that reason I wouldn't put anything else but OEM plugs.

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I'm a contrarian on this one, while the recommended plug is known to work well, It's not exactly required. To each their own and I agree with you in the advantages I think a properly spec-ed plug would work just as well.


I say this because I'm thinking of running colder plugs soon.


Side note this isn't really even new tech Saab tried it in the 70's I think

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2008 E90 335xi

Last edited by Ferris; 20th February 2019 at 02:55 PM.
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post #10 of 14 Old 20th February 2019, 05:42 PM
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Quote:
Originally Posted by chadjones99 View Post
... just because its a M5 doesn't mean only 1 part in the world will fit it. does everyone by OEM BMW tires the whole time what about OEM BMW oil filter maybe a lot of people but not all. so why would plugs be so special.
Actually, it kind of does. There are a slew of maps in the mss65 which calibrate the conductivity characteristics and "measurement volume" of the LKR8AP. These are used in both the misfire sensing portion of measurement which relies on the integral of ionic current after spark as well as the knock sensing portion. Given the length BMW went to properly characterize that specific plug, I can't see a good reason to switch when they cost less than two tanks of gas. They're $11/ea on Amazon.

Without putting it on a dyno and intentionally trying to induce knock and misfires and see if it still works, I wouldn't be willing to alter a portion of the knock and misfire sensing system. I have an engine here that spun a bearing and was tuned with knock sensing disabled (not by me). Lots of nice pitting on the edges. It's not worth my piston crown.
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