Sure the move to 5w-20 was partially due to fuel economy. Many engines that run 5w-20 could 5w-30 or 10w-30 without any problems. I still agree with you that 5w-20 is optimal considering the technology with the lower viscosity oils. Your example of 10w-40 vs 5w-20 is very different compared to 5w-20 vs 10w-30. P. AMSOILOE 5W-20 100% Synthetic Motor Oil. Fights sludge and deposits with 100% synthetic formulation. 47% more wear protection1 than required by the GM dexos1 Gen 2 Asstated on the oil filler cap, use 5W-20 oil when adding or changing oil. Ford Focus engine oil type. SAE 0W-20 (Synthetic Blend) – Ford C-MAX Hybrid |Ford Fusion Energy | Ford Fusion Hybrid Oil Change Intervals; Focus 2.0 16V (2008 – 2011) Duratec: 4.3: Use: Normal 16 000 km/ 12 months Use: Severe 8 000 km/ 6 months: eWift5v.

2008 ford focus oil type