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As taken from SIB 00 01 07-2008 model year prep and maint requirements.
"There are minor changes compared to 2007 models. N54 engines require their spark plugs to be replaced more frequently than N52K engines due to the nature of the direct-injection process utilized on the N54 engine. Condition Based Service (CBS) no longer displays the spark plug replacement interval on any 3, 5 or 6 Series."
Summary of Spark Plug Replacement Intervals:
Primary Model
Engine
Interval (miles)
Comments
128i Coupe and Conv.
N52K
100,000
128i Coupe and Conv.
SULEV/PZEV
N51
100,000
135i Coupe and Conv.
N54
45,000
328i, 328xi, 528i
N52K
100,000
No change from '07 models
328i SULEV/PZEV
N51
100,000
"
335i, 335xi, 535i
N54
45,000
"
M3 all versions
S65
37,000
550i, 650i, 750i
N62TU
100,000
No change from '07 models
M5, M6
S85
37,000
"
760Li
N73
100,000
"
Z4 Roadster 3.0i, 3.0si,
Z4 Coupe 3.0si
N52
100,000
"
M Roadster, M Coupe
S54
60,000
"
Whats so hard to understand?
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