I just changed the oil today and the service light won't reset. It blinks and shuts off, but upon the next start it is back on.
Any tricks to get it to shut off? It worked the last couple oil changes, not sure why it's stubborn now.

 

1. turn ignition to I
2. depress and hold trip button
3. turn ignition to II(while still holding trip button)
4. in about 5-7 seconds warning light(yellow triangle) begins to flash
5. release trip button WHEN yellow triangle is flashing(it flashes 5 times, if you wait for it to stop flashing, it will NOT reset), turn ignition off. byXC90Passenger

 

Thanks for the reply but that doesn't work unfortunately!

Here's a video of what happens:
S40 sevice light won't reset - YouTube