Hello all. I have a 95 M3 with 137k that is used mainly for auto-x and DE's (and occasionally driven to work). I have been using Castrol TWS 10w-60 for the past year, and Castrol 5w-50 before that. The 10w-60 removed alot of my ticking during hard auto-x runs. I am due for an oil change soon and wanted to change oil due to the increase in in price of 10w-60. I was going to try the Rotella 5w-40, RP 10w-40, or Mobil 1 15w-50. Anyone care to chime in? Thanks