After 4000 miles on my 2017 I have made the move to synthetic - Mobil 1 racing Oil. The main reason was to help with the crude shifting and cold start clutch drag of the TW. I can't really say it helped that very much, BUT, the engine seems to be running smoother and quieter. Is that for real or just wishful thinking on my part? Can synthetic oil make a significant difference in engine performance?