I didn't see a test kit for $40. Can you provide a link for this?
Blackstone also provides oil analysis and many have used their reliable and detailed reports for years. You can request and receive a free test kit form them in the mail. You only pay when you send your sample in for testing. usually, you get your report within days of sending it in.
The Standard analysis is only $30.
Here is a copy of my first two on my 2015 Equinox .
Note - - this particular test for mine was only after about 3,000 miles since it was winter and had many cold starts, sub zero temps, and from wife's short drives. So I changed it early to get fresh oil in for the rest of winter driving.
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