For weeks strange smell iM HEV mode

Hello, my XCEED PHEV now has 20,000 km on the clock. For a few weeks I have noticed that the car smells strict after getting off. But only if I was not on the electric road. Speak, only after highway rides usually (with 100-130 kmH). After country road rides, I don’t really file that yet. But I can’t definitely exclude that. In November 2021 an oil change was made. I filled in new splash water 6 weeks ago. There was something “next to it”. But the s I don’t see any oil loss. At least there is no stain on the floor. According to Messstaab, the stand is also fine. The cooling liquid is also on Max. The engine temperature indicator goes up to a maximum of 1 line below the middle of the highway. If I open the bonnet, then you smell that the smell comes out of the engine compartment. Only exactly I can’t locate it. The heater should not be. Because I had the heater “off” all the time today. H at because the clutch in the DCT in EV mode also a function? I only know that the clutch can stink in switchcars. But that was then more extreme and not comparable to the intensity. Have you already observed this with your PHEV ́s?