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Originally Posted by JonP  I use Purple motor oil because I like the cool purple color bottles they come in. 
Actually I felt a slight power improvement and better MPG from the OEM oil when switched to full synthetic. |
Not sure if you were joking or not but I, too, use Royal Purple (10w30 in the winter, 10w40 in the summer) and definately noticed a slight power improvement throughout the powerband, and an increase in fuel economy, as well as longevity of the oil between changes.
To the OP: When you do your change, you could pick up a magnetized drain plug and gasket; prolongs the life of the oil filter and extra insurance against small metal particles getting where they should not be.
And also to add, the last duration of RP lasted me 8k miles, and the oil had barely turned brown, and be sure to note that this is on a turbocharged car (excessive heat).