yea that what i have been trying to is figure out who that are using but i want to start oil analysis on a fleet of fire trucks that me and my dad own. we currently have 3 now a 2003 Mack watertender, 2006 international 7400 and a new 2008 ford F-550. and because i do all the work on all these truck i want to get regular analysis done. i found a place Blackstone Labs that will do it for like 25 bucks so i going to give them a try.