But, where is there an unrestricted speed on a road of in the US highway system?
2) Do you expect Crown owners to be towing heavy loads? Probably not. They would have a real truck instead for towing duties.
What are high speeds? That is in the eye of beholder.It’s amusing how the discussion has moved from essentially “the engine is designed for the oil and might be damaged by a higher grade” to “the (electric) oil pump might starve the engine with a higher grade” to “the US doesn’t drive at high speed” as the moving target of silly justifications.
It helps when you understand that there is no technical reason. It gets you off this merry-go-round.
The way lately Toyota does things, they will be buying more BMW engines and whole vehicles.