I've put 15w-40 in my Ford fiesta what should take 5w-30 should i been worried?

I've put 15w-40 in my Ford fiesta what should take 5w-30 should i been worried? - 1

If you are in a cold weather climate 15w-40 would certainly be too heavy of an oil to safely use. However, if you live in Miami, Phoenix, or similar, you'll be fine.

My advice is:
use the vweight oil that is called for by the mfr.
Bearing clearances dictae what weight oil should be used in an engine.
And in answer to your comment, I would get the 15-40 out as soon as possible & put the right oil in.