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E36REPAIR.COM
Spark Plugs
NGK BKR6E (6962) Copper
Inexpensive. Good performance with a shorter lifespan
Recommended interval is 20k miles.
.031" (0.8mm) Gap
NGK BKR6EQUP (3199) Platinum
Original Equipment Plug. Higher price + longer lifespan.
Recommended interval is 60k miles.
.020" (0.5mm) Gap
$8.45 NGK.com
NGK BKR6EIX (6418) Iridium
Alternative Plug
Recommended interval is 50k miles.
.031" (0.8mm) Gap
Spark Plugs and how they affect your BMW (Article)
An article from a dealership regarding different types of plugs if you're interested in learning a bit more about spark plugs.
Impact of spark plug number of ground electrodes on engine stability (Study)
A technical study regarding different types of spark plug designs.
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