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In all fairness "NOW" MB wants the (platinum tipped) sparkplugs changed at 100,000 or 4 years(4 years I believe pertains to what Albert is saying about being careful not to strip the threads!), but they are expensive plugs. MOST manufacturers have the same plan it seems like.
At one point pre-FSS engines were at 15,000 INSPECT and replace IF NECCESARY, and at 30,000 REPLACE (I don't know the implications of replacing them if they need it at 15,000, then what do you do at 30,000, automatically replace them if they only have 15,000 miles on them?).
There were some interim replacement mileages between "non-FSS" and "strictly FSS" (around 98 or so up to 1999 on the M111 and M104 motors, sorta like "non-FSS" engines living in an "FSS" world) where the were calling for 45000 and 60000, depends on the individual chassis).
One thing that bothers me about service intervals in general and spark plugs in particular is that there is nothing taken into account for the amount of HOURS the engine is operated. The engine is still running when sitting in a traffic jam, and the plugs are still sparking, although not as many RPM's.
Gilly
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