Best Engine oil for Ford Focus

I use Pennzoil Platinum or Ultra Platinum 5W-30 and the FL400S or an equivalent filter.

Mobil 1, Valvoline, or Motorcraft. Ive used them all and have no complaints so far, usually i use Mobil 1 since i can find the 6 qt box for a decent price at Costco.

I use Valvoline Extended Protection Full Synthetic 5W-30.

Very good on engines and your turbo especially (i have a 2014 st3)

I personally use Mobil 1. They all do basically the same thing if you're changing it often enough. I change mine between 3-5k miles typically.

Stick with 5W50. Brand doesn’t matter as long as it’s a quality supplier. I used Mobil 1 in the beginning

OP I have the same car and engine as you, I've been using the cheap Mannol stuff, whichever is cheapest. Also whichever the cheapest oil filter is from ECP at the time. Car is currently on 120k and I've been doing this for at least 5 years and it hasn't eaten itself yet!

Ford is telling me to change oil at my Focus every year or every 15000km (9300 miles)

Amsoil 25k Oil in a 2017 Ford Focus. Went 20k miles. Looked like standard 5k oil when it came out. Engine is still doing great 60k later! I do 7500 mile changes with Royal Purple now.

Castrol edge 5w30 in my Focus