CX 3 service interval

I've had a GX CS3 for several months and have about 6 hours of run time. I'm wondering what people are using as proper service intervals and what are they doing to their compressors? I've watched the Target Forge video where Bill recommends servicing every 5 hours. I've also e-mailed the GX folks and they said service only when it starts to slow down. Both suggestions seem a bit contradictory.
 
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