[sammyg2]

I spend a couple grand every month having oil samples analyzed by a company called Herguth Labratories.
I've been sending out oil samples and studying the results for decades.
The reason I do that is to analyse the condition of machines that cost up to $10 million, and that if they unexpectedly crashed it could take weeks to rebuild and could cost more in lost production than the machines are worth.
I've studied oil sample results for all kinds of machines and all kinds of oil and all kinds of operating conditions.

But, that little machine they are talking about (IF IT ACTUALLY WORKS) with tell you one thing for $30 that I will tell you for free:
most folks change their oil and filter waaaay too often. Throwing money down the drain.

Save the $30, save whaever you might think about investing, and just start changing your engine oil half as often as you normally would and change the filter at every other oil change and you'll save lots O'money (assuming you have a modern fuel injected engine that is running properly and doesn't need a tune up).