You can't check the oil level via the dash on your car. If your car has a physical dipstick, then that's where you need to check it.
By the way, oil on the dipstick in the P3's like yours aren't filled to the full mark - They're filled around 3/4 of the way up (Any higher & you'll get a warning on the dash). So if the oil level is 3/4 up the dipstick already, don't add any more oil to the engine. If you do need to add some oil because its below the 3/4 mark, then make sure its only added to the 3/4 mark & not above!
Early issues with these cars meant that Volvo had to recalibrate the dipsticks via recall. The issue was that as the DPF's tried to regenerate & failed, the oil level in the engine got higher & that triggered warning lights on the dash. So to compensate for rising oil levels due to failed DPF regenerations, Volvo recalibrated the dipsticks & the cars computer now thinks that 3/4 is full. This is why if you add too much oil over the 3/4 mark, you'll get an oil level high warning.
Volvo garages are aware, or certainly should be aware of this if you bring your car to them to be serviced. If you take your car to be serviced at a non-Volvo garage, then don't be surprised if they put too much oil in (That's simply because they don't know about the dipstick recalibration that Volvo did several years ago & fill the engine to the full mark on the dipstick).
So basically, don't fill your oil above the 3/4 mark on these cars & you won't have an issue.
