I have noticed that when driving especially when it's cool in the evening a fine spray of "oil" seems to eminate from the carbs (1700 XF with 40DCOE's). This coats the offside wings F&R occasionally the screen and the K&N covers. The performance has not gone off (recent RR no probs), oil consumption has not changed etc. The "Oil" is certainly comming out of the carbs / air filters (doesn't appear to be K&N air filter oil)
The "oil" has a strong smell of petrol
The car is run on ESSO LRP.
The only thing I can think of is blow back from the carbs of additives in the petrol
Any other ideas / possible causes ??