For my next oil change I'm planning to use one of the following D1 5-40, GC 0-30, or Redline 10-30, or maybe a brew of 3 M1 10-30 and 1.5 15-50 M1. I hate the start up noise with M1 10-30 by itself. If it helps I've got the 2.5L Nissan engine w/ almost 15000 miles. Any feedback is welcomed.