General Thick or Thin Oil

[JAMLAX]

In a few months from now I would like to do an oil change on my 2004 Fiat Panda 1.2 petrol. I'm minded to use the slightly thicker 10/40 oil. I've read different opinions on whether the typically colder winter months in Aberdeen (-2 to -4 degree mornings are not uncommon in December/January). Any thoughts on whether it would be ok to use 10/40 in summer and then use the slightly thinner 5/30 for the winter months?

 

[ninooo]

What's your reasoning?

 

[MrMagoo]

Use the oil that's recommended for your vehicle.

 

[koalar]

I don't understand the question

10W40 is the correct oil

 

[JAMLAX]

Thanks for all three replies.
10w -40 is the answer. Excellent!
You may be puzzled by my question...I must stop asking stupid questions
But sometimes the oddball question gets the right answer straight off the bat!
My reasoning? Just making sure I'm on the right lines!
Thanks again, now I'm clear on which oil to use summer and winter.

 

[koalar]

Just for reference