Does anyone has experience with Deves piston rings? They say the oil ring is a 4 piece ring somewhat stiffer than the Volvo original oil ring, but that it does get loose with the engine warm. Does this mean that the ring is hard when engine is cold? During a cold start this would be bad over time. They also say the compression ring is not chromed, so it will not be hard on the cylinder walls. All this makes no sense to me. Stiff oil ring, soft compression ring. What do you think? Thanks