Re: Mobil 1 5w50 posted by Diplomat1 on January 20, 2016 at 09:19 AM
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make change in recommended oils based on climate. A good 0w or 5w will flow in any weather in the continental US. It's still too thick when at room temperature, but that's the best we have available. For an operating temperature viscosity, I would go with a 30 weight for your NA. You could go with a 40 or 50 but I don't think that would be an improvement. The car would probably run a little bit hotter, have less hp and mileage, but that would be pretty minor difference.