Hi,
I'd like to make a few comments on this. Unless you have a fresh rebuilt motor and are adding oil to it, you should never change brand or weights. Any engine builder will tell you, decide on the oil you will use from the start and stay with it. Why, you ask, because when you change brands, you are just playing chemist. Different brands have different additives and they are not all compatable. I will ask, do you know what the W stands for in 10W30? The W stands for winter (10 weight winter, 30 weight summer). If you live in the north where you have exteme winters and drive your car in these conditions, you need the multivisc, if you don't drive in these conditions, it's useless. I am not a fan of synthetics in a turbo car for 2 reasons; 1st, if you change your oil every 2500 to 3000 there is simply no need for it, 2nd; synthetics do to it's molecular structure, does not hold additives, another words, the additives seperate. Mobile claims they have solved that problem but hey, they're trying to sell oil. You are better off if you live in warmer climates or only drive in the summer, going with a straight 30 weight, high detergent oil and change it regularly. If you know the brand that is in the car before you change, use the same brand. HTH