Originally Posted By: StevieC
I don't doubt that Ford has excellent control over it and there are so many factors that can play into it like old lady driving, poor fuel quality, poor oil quality and over extended change intervals, excessive idling, poor maintenance etc.
But we can't know for sure and I would rather an OE has taken steps to protect against it with the dual fuel injection setup until we can solve it in other ways.
Ford's mitigation techniques were steps taken to protect against it, something that doesn't absolutely "require" a more complex dual injection setup. As I recall, that wasn't even Toyota's original purpose of the included port injection, as it was to mitigate low-speed drivability issues from what I remember reading.
Ford used/uses camshaft timing to "wash" the valves with reversion, which is taking advantage of the cleaning capabilities of the detergents found in the fuel, which is why port injected engines don't have valve deposit problems.
While fancy oils might help reduce it, ultimately that's not a solution and why it became such an issue for VAG.
Poor fuel quality will cause problems on non-DI engines too, such as plugged injectors and deposits, so that's not something that is going to again, be isolated solely to the realms of DI.
