Can I top up my 2010 3ltr diesel with this coolant?

 

That really depends on what is in your system currently.
You should be able to read the specification off of the label & compare it to what's in your engine currently.
And this is assuming that your coolant may have been changed since 2010, and not be the original coolant - although it should be the same.

 

Sadly I have NO idea what is in my system right now.

 

I've seen both pink and orange coolant used in these cars. If your car now has pink, what you've illustrated is appropriate. If orange (Ford), use orange.
The bigger question is the state of the coolant presently in your car. If you have no trustworthy service history, check your pH with an or ask your local garage to do it. Maybe it's time for a flush, not a fillup.

 

Boris, one other thing. What you show (assuming it is the correct stuff to match what is in your car currently) is concentrate. You need to figure out how much you want to add and then add half of that amount with what you picture and then the other half should be with DISTILLED WATER (not spring, not tap, not purified, etc). I am very specific in this in that all the other waters out there have something absorbed into the water (heavy metals, salts, etc) and these items can cause negative effects on your aluminum radiator. You won't see the effects immediately. You will notice in a year or two when your radiator suddenly springs a leak.