RE:TMX crude QUALITY concerns....................from what I read elsewhere....the "volatile products" are added to bitumen to make it flow through the pipe/equipment....Gulf coast refineries are used to that "recipe"....it's new to the California customers.
TM has always been unique in that it can and was desgined ship multiple grades of unrefined/refined products....known as "batching"....it's been doing this since 1953!!! I'm not sure if the problem is from batching....there was never a complaint about it before.
https://www.transmountain.com/pipeline-system