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I ran Castrol 5W40 full synthetic for 10 years and changed it every 3k miles. Compression was still good when I sold the car at 112k miles and 100+ track days. Noticeably less startup chatter than with 0-40 I used before.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
Last edited by Topless; 03-16-2016 at 02:35 PM.
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