04-30-2014, 08:49 AM
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ich fahre, also bin ich
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Join Date: Mar 2002
Location: South Florida
Posts: 1,671
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Probably at least every 300 operating hours.
this particular model recommends every 100 hrs (p.11): http://c.shld.net/assets/own/spin_prod_683865201.pdf
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Prost! 
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