Quote:
Originally Posted by Flavor 987S
Used Red Line 5W40 for a few years with excellent results. Now, for the past 2 changes, I am using Porsche approved 5W50 Mobil 1. Hard to find oil, but it's out there. I like the results even better. Here is my UOA:
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isnt the 5w50 the racing oil with group IV?
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