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BMW M5 F90 (2018+) General Forums Engine, Exhaust, Drivetrain, Tuning Modifications    Change your plugs!! Photos 18k miles stock plugs

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      10-23-2021, 10:09 AM   #23
AHall
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The maintenance manual says change sparkplugs every 30,000 miles. This is based on a factory car without modification I assume.
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      10-23-2021, 03:57 PM   #24
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Quote:
Originally Posted by azpaul View Post
Wow great detailed insight. Thank you!!
Thanks for the kind words.

The company I purchased the W175T30 Bosch spark plugs from 50 years ago, Southwest Diesel and Electrical, is located not far from you in Phoenix. To my amazement they are still in business!
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      10-28-2021, 12:24 PM   #25
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What colder plugs are people with mod replacing the factory plugs with?
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      10-28-2021, 12:59 PM   #26
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NGK 97506. I have them installed on the F90 and had them on my built F80.
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      10-29-2021, 12:43 PM   #27
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Originally Posted by FatRear08 View Post
NGK 97506. I have them installed on the F90 and had them on my built F80.
how did you like your built f80 at what hp you think you should start the build from stock 600 wheel?
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      10-29-2021, 01:04 PM   #28
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What is the NGK code for 1 step colder and website with info?

Where can a guy grab a slim socket, size, and does it need to be swivel?

Thanks
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      10-30-2021, 12:11 AM   #29
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You guys know what bad plugs look like, right? Heh, if you're replacing them every time they don't look brand new you're doing it wrong and not gaining anything. People run MMT octane booster once, pull their plugs and freak out because they're orange and replace them...that manganese coating has zero impact on spark efficiency, and that's not what denotes a fouled plug. Even the first post, the plugs look fine for another 5-10K miles. It's normal to have slightly higher soot concentration on a DI motor plug on the insulator (white part of the plug) - there's no signs of oil, overheating, knock, or glazing, and a true worn plug would have deteriorated all parts equally (electrodes and insulator) with noticable and uniform cavitation on every exposed piece of the plug - that's not in any of these pics. A true worn plug will also continue to fire just fine at the expense of worse fuel economy from an incomplete burn, and that's after you're pushing them waaaay past due (none of these pics) - just saying, save your money and follow the factory 30K recommendation unless you've fouled them from bad gas or extended driving on a poor tune.
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