... there didn't appear to be an old fashioned way to test the oil, and I did read the manual.
Guess why there is no dipstick?
"... manufacturers claim, because most of us don't use it". Yup, years ago Porsche decided people were to lazy to look at their dipstick so they made it a simple thing, just push a button.
I was just surprised that after only 3500 miles the light came on
Outside of catastrophic failure, the light should never come on. There is only one common way that could happen.
Since you said you read the manual, then you read
"... check the oil level each time before refueling."
Since you read your manual, we'll rule that there wasn't a slow, gradual decline in oil level in the sense of the engine slowly burning oil. You would have noticed the green lights and the bars going down.
So one way is how you drive. If you have driven a bunch of short trips, never getting the oil really up to temp. Then got the oil hot, boiled away moisture and fuel, and bam, you are down a quart. That can happen.
If that's the case, then the answer is to crank that car up and get the oil hot every outing.
If its not a case of fuel and water in the oil being boiled off, then chalk it up to normal consumption but since you are checking the oil everytime you get gas, you should not see a yellow light because you would be anticipating the decline as you observed it and took precautions.
"The difference between the minimum and maximum marks on the segment display is approx. 1.06 quart "
So before it hits the fourth line, add 8 oz, check, if it needs more, add another 8 oz. Etc. Do not overfill.
good luck
