As a retailer....on our point of sale register, it asks the customer if they would like a...
1. Printed receipt
2. Email receipt
3. Text receipt
or
4. No receipt
.
Your choice
.
Most choose #4
When my oil level rose to 1/2 quart over full,
and reeked of gas, I didn't need a lab to know I had fuel in the sump.
Just didn't know how much %....but knew it was too much.
Oil change and 91 E0 gas fixed it for me. YMMV