Does Rotella Synthetic 5w-40 have adequate anti-wear additives when compared to Mobil 1 0w-40 and 5w-40? I'm only running my GM 5.3L about 10K/year and would like to do 2 changes/year. Do you see any problems going with the Rotella, or would one of the Mobil 1 products be significantly better for this application? On another note, this truck sits for a couple weeks at a time without a start. Would one oil be significantly better than another for protecting in this situation?