i got a JDM imported motor for my civic. ive changed the oil 3 times on it so far, using penzoil 10/30 on it. i was planning on changing to an oversize mobilo1 filter and redline 10/30, and then going straight to a drag race track where i will probably run it down the strip 6 times or more. should i wait until after the drag races to change to synthetic, or wait until after the races to do so? i was told by someone that racing on a motor that was recently changed to synthetic from regular oil is very bad for it. what do u guys think?