I was at my local wal mart buying pp 5W30 for my wife's car when i saw supertech full synthetic oil for only $17 for a 5 quart jug. not knowing a whole lot about this oil i decided to stick with the pp5W30 oil, but is this in house oil actually good? or is it just another bottom of the barrel special? does st have good voa's or uoa's? I am sticking with pp but i am just curious to know.