I use Castrol Syntec / Edge 5w40. We probably have similar weather conditions. But you use whatever you like. Just change it every 5K mi or annually, whichever is lower.
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GPRPCA Chief Driving Instructor
2008 Boxster S Limited Edition #005
2008 Cayman S Sport - Signal Green
1989 928 S4 5 spd - black
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