carbon build up on Direct Injection engines

[oldjoe]

has anyone had problems with this on their petrol DI engine. with all the fuss about diesel going on and possible tighter restrictions on it i plus DPF issues. as i now only do fairly short journeys decided that i would look to petrol for the next car , something along the lines of the Sport Nav 6

[V 249]

Had the 2 litre Petrol for over five years and had no bother at all. Car does not do huge mileage, mostly
in the warmer months. The Car is serviced each year, and upto now that is all that has had to be done.
Not heard of anything nasty on Mazda Petrol engines.!
Fingers crossed it continues  as before.!
 

[oldjoe]

was thinking about carbon build up on the back of the inlet valves that can  lead to expensive problems. it a is well documented problem with direct injection.   toyota have but an extra injector in some of their engines that puts some fuel into the inlet port to wash the valves off