Porsche uses M1 0W-40. This is also known as Europeon Forumla as it meets all the German specs. Most US oils actually DO NOT meet this spec, so if that matters to you, try to get your hands on EP.
Wal Mart usually DOES stock this oil but is sometimes out. It is usually priced at about $5.49 per qt.
Good luck.
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Rich Belloff
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