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Agreed. I have run Castrol 5w40 over the last year and notice less valve train/chain noise on startup. No other changes or indications I am aware of. I change oil typically 2x yr between 3-4k miles since I have been running Time Trials. If the oil ever darkens or gets an odor I dump it right away.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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