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#1
03-01-2002, 11:00 AM
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Spark plug life expectancy
My M103 has been stumbling a bit when starting cold. It's been about 30,000 miles since I changed them for other reasons (valve guide seal change) and I got to thinking about the spark plugs. So my question is, is it about time to R&R them?
__________________
5 speed '91 190E 2.6 320,000 mi. (new car, fast, smooth as silk six, couldn't find any more Peugeots) 5 speed '85 Peugeot 505 2.5l Turbo Diesel 266,000 mi. (old car, fast for a diesel, had 2 others) 5 speed '01 Jetta V6 (new wifes car, pretty quick) 5 speed '85 Peugeot 505 2.2l Turbo Gas 197,000 mi. (wifes car, faster, sadly gone just short of 200k ) 5 speed '83 Yamaha 750 Maxim 14,000 mi. (fastest) 0 speed 4' x 8' 1800 lb Harbor Freight utility trailer (only as fast as what's pulling it) 
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#2
03-01-2002, 11:38 AM
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Cap & Rotor? And if they're not that old but look bad, then your coil?
Maybe I'm paranoid, but I just went through this and shortly thereafter my coil failed, stranding me ('88 300TE, 177k miles, maintained fastidiously)
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"If God had meant for us to walk, why did he give us feet that fit car pedals?" Sir Sterling Moss Michael 2014 E63S Estate 2006 SLK55 1995 E500 1986 Porsche 944 turbo
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#3
03-01-2002, 04:35 PM
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Anybody?
So what is the recommended or suggested replacement interval for spark plugs.
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#4
03-01-2002, 05:52 PM
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With plat. Bosch says 100k I think, but I do mine with every fuel filter change about 15-20k.
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#5
03-01-2002, 06:12 PM
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60k is the interval in your Owner's Manual. I stick to that interval.
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"If God had meant for us to walk, why did he give us feet that fit car pedals?" Sir Sterling Moss Michael 2014 E63S Estate 2006 SLK55 1995 E500 1986 Porsche 944 turbo
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#6
03-01-2002, 07:02 PM
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Jim:
The Bosch H9DC/H9DCO plugs that your engine uses are relatively inexpensive. I change mine annually, irregardless of mileage. Plug condition is somewhat an indicator of what's going on inside your engine. An annual change gives you an opportunity to see how things are.
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Mike Murrell 1991 300-SEL - Model 126 M103 - SOHC "Fräulein"
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#7
03-01-2002, 10:58 PM
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I replace mine every 15k miles. The plugs start to show significant wear around 30k miles. I would recommend no more than 30k on a set of plugs.
__________________
Scott Diener 89 300E 93 300E 92 Volvo 740 Wagon aka "Mutt mover"
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