Motor check oil analysis clinic versus Blackstone laboratories? Is there really much of a difference? The only reason why I'm asking. I sent out a sample to Blackstone labs. Over two weeks ago. It's still MIA the post office can't locate it, so I'm going to send out another sample, so I was thinking about going with someone else, I realize it's not blackstone's fault, but I was just curious..
Thank you...
Thank you...