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One thing you have to remember is that oil pressure is the highest when the engine is cold....just watch your oil pressure guage and you will see this. The 0W40 will actually be THINNER than the 5w30 at startup and will only have a slightly higher pressure at operating temperature. According to...

I'm going to start initially with a 7k drain and having it analyzed. If everything still looks pretty good at that point, then I'm going to try and work up to 10K. 0w40 is designed for the european engines that all recommend drains of 10-15k anyway. I don't think it will be a problem.

I have a Chevy Silverado with a 4.8L Vortec engine. I have been using Mobil 1 5W30. I've heard "good to excellent" reviews on Mobil's 0W40 formula. It seems to be well-engineered for longer drains. My owners manual refuses to recommend anything other than a XXw30 oil. I would like to try the...