Thanks for reading, I am installing a amsoil bmk30 eabp110 on one of the trucks in our fleet. The truck is an 07 freightliner Columbia detroit 14l., emmissions Turned off, the truck has over 1m miles and right at 100k on rod and main bearings and new oil pump (they were replaced during an inspection showing heavy wear). I have been running 9 gallons of mystic 15-50 and 1 gallon of mystic viscid lube (which I can't find any info on bitog) each oil change which is done every 20k. It prob burns/leaks 2 gallons every 20k. I have sample bottles on standby, the current oil has 10k on it and I am going to change to baldwin blue filters dbl3998 and install the bypass kit. I am considering changing to rotella t6 as well . We haul very heavy loads locally 22 miles each way and run very hard in nasty dust\paper ash so I feel guilty for the 20k mi changes and want max longevity. Any thoughts appreciated Also quick side note I'm also going to send off a sample on my other truck (glider kit ) 12.7 detroit 206k on it, it has 36k on rotella t6, and iv changed the filters twice at 15k intervals and I'm about to send off a sample , switch to the synthetic media baldwin blue dbl3998, and the send another sample shortly after to see what the results are with the better filters. After lots of research i was putting together my own kit an decided to go amsoil instead ,would love y'alls input!