What type of oil do you use?

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MazdaSpeed Protege Blue
I use Royal Purple Racing oil 5w30 and I think I can feel the difference.
 
Mobil 1 0w-40 with Purolator PureOne filter. Fram is garbage. The 0w-40 meets stringent European standards for longevity and performance, and is also a factory fill on all Porsches. The change interval can be extended to 10-15k miles depending on the amount of abuse the car sees.
 
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