Im curious as to who y all send your oil for testing to?
Which one gives the most complete results or are they all the same and
What is the usual turnaround time for the results?

 

I use Blackstone Labs. They return the analysis by email usually a week after I mail it. I like them because they provide a written interpretation of the numbers and give you a recommendation. Most labs just provided the numbers.

 

^^^ ditto.

 

Blackstone in past , now Cummins .

 

For me, Blackstone is awesome. They actually look at previous results and give you a paragraph on how your motor is doing. Well worth the $$, IMO.