I'm pretty sure the manual says to keep the engine under 4k RPM during the first 5 minutes of driving. And it also states do not lug the engine, but I don't think it defines lugging precisely.
I try to keep in the 2000-3500 for the first 10 minutes, then I try to keep it over 2500 RPM.
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'01 Boxster S, 51k miles
'05 Mazda 6 Grand Touring Wagon
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