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Pulled this code yesterday. The vehicle is an 03' Altima 2.5L with 97K. All I got from the web was that for Nissan it's about the "Vacuum Cut Valve Bypass Valve" who's it's function is to prevent engine vacuum form being applied to the fuel tank except for self test purposes, and it can trigger...

Is there any possible problems to mixing these two Valvolines? There is currently a sale on 4.73L Synpower 5W30 & 10W30 at Walmart in Canada (that's about half price on any kind of syn around here...) which I was considering to take advantage of. But I want to go with a mix of 30 & 40 for the...