I've been lucky enough to have had a supply of the old VR1 10w30 that I've been running in my old pickup for a while now. Now that I've run out, I've come to discover that the new VR1 10w30 is now synthetic. Has anyone made that switch? Is the new stuff just as good as the old? I'm running a 302 2bbl motor from a '76 F100 in my old truck.