I asked if I can use synthetic oil from the start on a 2003 5.4L SOHC V8, here's their response:
quote:Anyone have any synth blend/synthetic 5W-20 oil analysis to show that it can handle abuse???
You must use the 5W20 motor oil if your owner's manual recommends it. Mobil1 0W20 motor oil will be available in March 2003 which will be approved for all 5W20 vehicles and you can switch over at this point.