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#1
05-29-2010, 05:29 AM
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1989 300TE M103 Spark Plugs
G'Day, i hope you can help. I am stuck between using NGK BP5EFS or the cooler BP6EFS. I currently have the latter but after researching the web it seems the decision is split. Can anyone advise me correctly on what plug to use?
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#2
05-29-2010, 07:46 AM
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Hello Ned. I'm not sure it's a matter of "correct" so much as it is what's better suited to your driving conditions. It is generally regarded that a hotter plug is better suited for lots of in-town driving, while the cooler plug does better when the car is operated mostly at freeway speeds. My driving tends to be more in-town driving, and I use the BP5EFS plugs in my M103, and they do very well under those driving conditions. That's what my experience has been; someone else can chime in with a more technical explanation of why that is. Have you checked the NGK website for an explanation and a recommendation?
__________________
1988 California version 260E (W124) Anthracite Grey/Palomino Owned since new and still going strong and smooth MBCA member Past Mercedes-Benz: 1986 190E Baby Benz 1967 230 Inherited from mom when she downsized 1959 220S Introduced me to the joys of keepin' 'em goin' There are only 10 kinds of people in the world--those who understand binary and those who don't
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