I did some researching on 5w-30 oils, synthetic and dino. namely: Pennzoil PureBase 5w-30 Chevron Supreme 5W-30 ST Synthetic 5W-30 and M1 5W-30 It seems to me the Pennzoil dino 5W-20 has a pour pt of -42C, while the Chevron Supreme is at -43C. Off the top of my head, the M1 was -48C. The ST Synt 5W-30 was around -45C. The viscosity (centistrokes) at 40C showed the M1 being the thinnest with the Chevron Supreme being the thickest. 53.7 = M1 56.8 = ST Synthetic 60 = Pennzoil 66 = Chevron Supreme at 100C, the viscosity for ST Synth and Pennzoil were at 10.5 while M1 was at 9.7 and Chevron at 10.8 So can I draw the conclusion that the M1 will flow the best (out of the 4) with ST synth a close second, w/ Pennzoil and Chevron taking up the tail? Im not saying if any of these are "crap" are the "best" oils, just comparing them to one another.