Hi In another thread I said I was concerned about the many short journeys my Jeep made and its effect on the Oil so I had it tested. I sent a sample of my Oil away for analysis. My analysis was not as comprehensive as your Blackstone ones but I will type in what I can and would welcome any comments. The company that did the analysis was Millers in UK. Not sure if you lads have heard of them. Oil was in vehicle 6 months and covered 4000 miles. PETRONAS Syntium 5w/30 Density @ 15.5c (g/ml) 0.855 Viscocity @ 100c (cSt) 12.00 cSt Calcium (%) 0.261 Zinc (%) 0.119 Wear Metals in ppm Cr 1 Pb 0 Ni 1 Sn 0 B 60 Fe 28 Mo 5 Si 9 V 0 Al 4 Cu 2 Na 10 Analysis reveals Oil to be in good condition and suitable for further use. We would advise change at 12 months.( Millers comment) Any comments from the Forum most welcome.