The new 5w20 oil is made for certain new Ford models. Ford claims it produces less CO2 emissions and helps fuel economy. All 2001 Fords except the 4.0L Explorer, 3.9L LS , and new discontinued 3.3L Villager where shipped with the new oil. The plan is to have all new Fords running on it, which they probably have achieved by now. I just hope this doesn't encourage other manufactures to develop their own oil because we'd be paying an arm and a leg for MB oil.