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Disclaimer: I know virtually squat about oil chemistry etc. Now that that's out of the way, I have a 1989 Porsche 944 S2 track car (3.0l, 16 valve, 4 cylinder, 100,000 miles) and am wondering which is the best weight Mobil 1 to use. Most of the guys I run with use 15W - 50 but I know that the...

Hi- I just bought an '06 F-350 diesel and while I've had several diesels in the past I'd like to start out on the right foot and take good care of this one. I'm interested in oil brand and filter reccomendations. I run either Shell Rotella or Mobil in my other diesel equiptment and whatever...