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From what I have been able to research, Castrol Edge is supposed to be the next generation and a step up from Syntec. A better oil. Where I live I have only been able to find "Edge" in 5-30 and 10-30 weights. Because both of my Boxsters are older (98 with 132k miles & 2K with 52k miles) I'm staying with the 10-40 weight.
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