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Old 03-17-2023, 03:44 PM
Join Date: Mar 2006
Location: Washington, DC
Posts: 746
nick325xit 5spd is on a distinguished road
Originally Posted by StephenVA View Post
The 3199 BKREQUP plugs are the multiprong plugs that were popular in 2000. Every manufacturer spoke about the ability of multiple ground straps (Prongs) would provide long life which they did compared to single ones. Technology moved on to fine wire plugs with center electrodes with precious metals that provide better idle stability/ignitability characteristics for lean conditions, better tip in acceleration, and better fuel economy.

Take a look at the Iridium IX - Part No. BKR6EIX, Stock No 6418, Plug gap .032

Personally, I prefer to just run the copper plugs (BKR6E) and change them out frequently. Especially on these higher mile cars that probably have some blow by. Long lasting plugs aren't that long lasting when the car makes them crusty.

There are exceptions to this. The S65 in my E90 M3, for example, does knock sensing through the spark plugs through some kind of bizarre sorcery. If you don't keep the plugs fresh (max 30k miles, preferably less), you'll lose a ton of power. And you can't swap to alternate plugs without dyno testing.
2011 M3
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2004 X5 3.0i 6MT
1995 M3 S50B32
1990 325is
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Old 03-18-2023, 11:47 AM
Join Date: Apr 2015
Location: Sacramento
Posts: 194
stiubhartach is on a distinguished road
Oil on the electrodes means oil in the cylinder which can come from three problems.
1. Oil in the intake manifold from a malfunctioning CCV system
2. Valve stem seals leaking
3. Piston rings leaking

Start at the easiest to check and work your way down (#1, #3, then #2)
A. Look in the intake manifold for oil (fiber optic camera)
B. Compression test to check rings
C. If the two above don’t show problems, then it’s probably valve stem seals
2005 X5 4.4i SterlingGrau, Sport Package, DSP
Build 3/12/2005

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