Yeah, there's no way it was just VW. All the other companies making diesel engines must have known, or at least suspected, what was going on with the VW TDIs. T

Yeah, there's no way it was just VW. All the other companies making diesel engines must have known, or at least suspected, what was going on with the VW TDIs. There are pretty fundamental reasons why diesel engines have to choose between efficiency and emissions, and when VW announced that they built an efficient engine without a urea device everyone else must've scrambled to find out their "secret", until they realized there wasn't one. The fact that they didn't blow the whistle is pretty compelling evidence that they're up to the same stuff.