What type of full synthetic oil to put in 2005 ford focus?

I have a 2005 ford focus ST zx4 and need to add oil, this is the first time adding oil since I bought the car. All I know is that the previous owner used full synthetic. I have to add just about a quarter of oil until an oil change in a few weeks. I have heard that full synthetic 5w-30 or 5w-40 is good but no lower than 5w-30 or I can take the chance of blowing up my car… Any thoughts on this?

Why not just change the oil now. Read the owners manual for viscosity for your vehicle. If not now then just pick ant full synthetic oil and add, better than running out or running low.

5W-20 is the correct weight for that car. 5W-30 would be okay, I would not use 5W-40, it's going to be twice as thick at temperature than the spec'd 5W-20 oil.

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