10-09-2007, 10:43 AM
i didn't notice much difference going from dino 10w30 to full synth 10w30 in my wrx (i did notice much higher oil consumption tho :ph34r: )
i did notice about 3-4mpg decrease going from dino 5w30 in winter to dino 15w40 in summer
i did notice about 3-4mpg decrease going from dino 5w30 in winter to dino 15w40 in summer