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Cheers
My car has the newer version of your engine. I suggest to do go for a partial grill block in the colder days because it warms up faster, improves aerodynamics and on slower runs the coolant stays at optimal temperature. You can semi block both the upper and lower openings.
I would advise against EOC and using too low viscosity eco oils or fully extended oil change intervals, these cars have very delicate turbos and engine bearings and it`s just not worth risking it.
As for aerodynamics the easiest thing is to check all underpan plastic covers are intact and maybe adding a small front air dam from black rubber. Vauxhall Astras use it and it does the job while being discreet and doesn`t shatter when it gets hit.
Good luck!
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