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When I changed over from Mobil1 0/40 to Castrol 5/40, Jake (IIRC) recommended that I do a "flush" with a high detergent oil, like Valvoline VR-1 Racing Motor Oil 20/50. Which I ran for 15 minutes, drained, and replaced with the Castrol.
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2001 Boxster, 5 spd, Seal Grey
Last edited by clickman; 11-14-2014 at 02:11 PM.
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