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oil viscosity


Model: 911, Year:2004, Mileage:50000, Type of use:Both Street & Track
I have a 2004 40 anniversary 911 with 50,000 miles and on cold start the cars icle is rough I've been using Mobil1 0 40 every 5000k. Car has new plugs ,coils and injectors as well as The intake solenoid accuator camshaft bank 2. The car rides strong no longer misfire or CEL, but my mechanic recommends since we live in south florida that I run mobil 1 15 50. He says that will make my starts smoother. I've heard pro and cons ?????

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