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I know Porsche now use 0W40 Oil for year round use. If you only drive your Box in warm weather I guess you're O.K. because the 15W will never be factor. But the higher the Viscosity the more resistance to flow the oil will have and the more wear at every start-up you will have after the car has been sitting for a couple of hours and the oil has all run back down into the pan.
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2000 Boxster S: 18" Turbo wheels w/color crests, Litronics, Onboard Computer, Traction control, Cruise, Painted rollbar, Leather interior, Aluminum package, headlight washers, Porsche GT3 seats, windstop, Hi Fi six speaker amp package, DSP, CDR 220, Limited Slip, side airbags, BK Rollbar extender.
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