I read a very interesting article on autosport today saying that the Renault powered teams could face grid penalties later on in the year. This is due to a 5 engine limit and apparently Vettel and Kobismashy have already been through 4 each
Only quarter of a way through are they really going to last that long. Obviously they can use parts from those other engines but it then gets really complicated when Renault are bring upgrades and modifications all the time for it to all fit together.