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Mobil One 15W-50, 5W-30, and 10W-30 had been the Mobil brand oils approved by Porsche for many years, along with other brands, such as Castrol. In June 2001 Porsche changed the list. The Mobil One approved is now 0W-40 and 5W-40. I still use 15W-50 as I live in sometimes sunny California. Castrol 5W-50 was and still is an approved oil. With your wide range of temps I would use the Castrol. Jeff
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