First off, do you think you should flush do to compatibility issues of mineral oils vs synthetics? It is true that you do leave behind some old oil upon change out. The % left behind will not adversely affect the new. In a perfect world, you would have it drained completely then add, but thats not happening.
Mixing the oil technology won't really hurt you - many companies do it now, they are called semi-sythetics, synthetic blends and para synthetic engine oils.
As far as flushing to get out contaminants, PM me your shipping address and I will send you a flushing oil that you can add directly to your crank/sump, drive around a bit than drain. I promise it won't mess up your engine and it will safely get rid of any depsits that have built up on the rings and bearings. Again, I promise it won't moneky up your workx!
(Targa911S - you make me sad, you should have PMd me on this)
