5W-30 comparisons (ST, Pennzoil, m1, chev)

[metroplex]

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.

 

[novadude]

Mobil Drive Clean Blend 10W-30 is 69 cST @ 40 C. Does this mean that the Mobil 10W-30 Synthetic Blend flows almost as well as Chevron 5W-30? Pour point is -42 C (-44 F) for the 10W-30 Mobil Blend.

 

[Ken2]

1) Gr-IV & GR-III oils have better cold flow than GR-II oils...no surprise. 2) Oil at the pour point is too thick to lubricate well. 3) Does 5°C @ -40 something make that much difference? I'm not sure.... 4) +40°C = 104°F...all these oils will flow well under a black hood on a hot New Jersey summer day. Ken

 

[metroplex]

these are the specs that the manufacturers supply, and if one oil is slightly thicker than the other at 104F, then there's BOUND to be a difference at 0F. I can shake 80W-140 Redline and 75W-90 Redline and notice that the 80W-140 is thicker (less sloshing noise). And what do you know, the cSt @ 40C shows the 80W-140 being thicker. Anyone check what 10W-30s go for in the cSt @ 40C?? I thought the Chevron Supreme 5W-30 was a tad thick for a 5W-30 oil. It might be loaded with pour point depressants to get that -43C rating. I think I'll stick with Pennzoil. The difference between Pennzoil and ST synthetic isn't enough to justify a $1.50+ difference.