I switched to synthetic, mobil 1, after an oil change in my 05 burb once. The oil coming out was regular and I put some on my fingers. I pushed my fingers together and the used oil lubricated no better thsn water. The next change was the same test with synthwtic, but no matter how hard I pressed my fingers together the oil was slipperry. In short, the synthetics are better imho. Burb and commuter car are both 5w30 so its just easier for me to run same oil in both. Commuter car gets flogged mercilesly so I hope synthetic makes the engine go past 160k. The wifes and kids cars have turbos, so I might have bought into the formulated for turbo cars on the PP oil. The only thing I need to figure out now is if the direct fuel injection engine in the Audi is ok with either PP or Mobil 1.
Brutal, how about a ride?