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Registered
Join Date: Sep 2004
Location: Northern Chicago suburbs
Posts: 1,399
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Since this post started over one year ago, I must modify my choice of oil. Though I feel Royal Purple is still a very good choice, I'm now on my third fill of Castrol Syntec 10W40, based upon input from some very knowledgeable folks. The engine continues to run smoothly, while I still freshen the crankcase every 3000 miles, at most.
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'73 911 Frank 'n Meanie
2002 Boxster S
PCA Instructor Circa '95
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