Quote:
Originally Posted by Flavor 987S
I can tell from the UOA that the 50 weight is doing it's job, because the zinc and phosphorus are lower than Red Line's content. And wear metals went down with a longer drain interval.
I think a 5 weight is better than a 0 weight because it narrows the gap to 50 and keeps the range tighter. A 0 weight would be good for a very cold climate (when my cars are stored). There are no 10 weight oils that at Porsche approved for the 986/987/996/997.
My car sees a LOT of +6,000 RPM's (shifting).
I'll post my cumulative UOA from the past 4 oil changes one day this week, when I get a chance, and you'll see the data.
Without the UOA's I'd never know that the Red Line 5W40 was a great oil, and the Mobil 5W50 appears to be as good or better.
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From the UOAs I've done so far, M1 0-40 is by far the best. P and Z levels consistently above 1000, Moly at 90, always in the middle of the viscosity range. With Mobil 15-50, Z and P were in the 750-850 range, Moly in the 20 range and it had sheared below grade after only 1k miles. Valvoline 20-50 also had low Z, P and Moly, but stayed within viscosity grade.
But to repeat myself, the issue I see is that until you drive your car for about 1/2 hour, its not up to operating temperature, and a 0 weight oil will provide better protection during the crucial warm up period.
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