Group, I am trying GC in my 300m for the rest of the year. I had Mobil1 0W40 in there for 6200 miles. I sent a sample to Blackstone for analysis.....and I plan on doing the same after I am done with the GC to see how it does. Then I will decide on what to run in my M for the duration. I already notice my oil pressure is my dynamic.... Mine was Gold BTW.... Made in 06. I am using a ACDelco Ultraguard oil filter (UPF2) BTW, I am going to start my fall racing in September. Any thoughts??