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Your mechanic is a moron
0W is a cold rating and the oil at normal temps is not thinner
Additional 0W-40 is a Porsche recommended weight.
Whether are not you actually "need" 0W is another matter. You don't need it for non freezing temps, but it does not hurt
You are fine using 0W-40 oil
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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