well, after the last oil sample i thought i'd go for something a little different. since we don't have enough data from home brew, i'd thought i'd kick some in. i emptied the mobil 1 at about 4800 miles and sent it in for analysis, then reloaded with 2 quarts pennzoil synthetic and 2.25 quarts of pennzoil purebase (all 10w-30). i will be sampling at 5000 miles, then pull the oil or leave it in depending. if that sucks, i'll just keep sampling different oils and posting analysis. what the **** , it's all in the name of science.