Greetings! This is my first post so be gentle. I plan to start oil analysis programs for my two vehicles and I would like a recommendation or two regarding a lab. I'm aware of Blackstone and Oil Analyzers Inc., but, how about Titan and/or Herguth Labs? Anyone have any experience with these? Obviously I would like to spend a reasonable amount, $25.00 should be sufficient for an analysis including TBN. The cost of mailing might be additional. Thanks.