Add 1 Liter Oil??
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my 2004 S55 popped up the same message, which stayed on for about 10 seconds then went away:
Add 1.0 liter oil at filling station
I've not seen this in the 17 months and 21K miles I've had the car. It's due for a Service A in about 1,200 miles.
It happened during WOT acceleration.
Normal?

Start the car up and warm it, then turn it off, wait 5 minutes, and check the oil with the dipstick. That's the best way, since the onboard computer can sometimes be a bit off. Also make sure the car is on level ground.
During the last Service B, they put in too much, manual says 7.9 quarts, they put in 9 quarts, so they had remove some, possibly took out too much resulting in this error this time.
Anyway, they say 1 quart every 1,000 mile is normal, but should look out for leaks or burning oil.
So, if there is no trace of leak, leave it alone. However, I agree that the oil should be measured to check how much is needed to fill the system without going over the normal quantity.






