I grew up changing my oil every 2,000 miles and thinking about going 15k makes me cringe, but that’s the way it is today with new engines & oils
Yep I get it for sure, if the TBN levels are good and not a lot of issues, might as well run it.
I use the truck we dont tow giant stuff with it, but we use it for hay and pulling some smaller trailers, I plan on keeping it as long as it does not rot away.
I have not had any issues using Blackstone, I like the payment plan they have set up, because I can forget to pay for more supplies from others, some companies you pay up front and they give the supplies. This way I have 2 sample kits on the shelf ready to go if I need them. There is not much to a plastic bottle I get that.... but the paperwork is all set up, I made their pdf form into a fillible form so its super easy to fill out on the computer. They answer emails quickly if you have additional questions.
You don"t have to change the oil to sample it, I guess I could pull a sample at 6k interval and then change and sample the 9k interval, if major issues then go back to the 6k sample if needed to see where I was, and fall back to the 6k interval, if I sample at 6k and 9k the cost ticks up for little gain IMO.
I"m still going to use OA for what it is, just another diagnostic test, data can be interpreted many ways.
Attention: TDR Forum Junkies 
