Done my first oil change a few days ago. Switched from motomaster 5w20 synthetic. Noticed no difference on -25℃ start on the 2.5 Fusion. Next change is on the 04 hemi. This engine has ran k. everything I got for free at work, 15w40, 10w30, 5w40, 5w30, 5w20. 0w40. 15w40 at -40, she cranked real slow