Hey guys, I was looking at data sheets I have for delvac 1 and mobil 1, and its quite confusing to see delvac 1 have a cold cranking rating of a 10w, when it is rated 5w! I also included the cold pumping ratings which have a similar trend.
I don't blame the 40w for the higher CCS, because you can see the 0w40 is not much higher than the 0w30.
Maybe its because Delvac 1 is not as friction modified, but then, the cold pumping ratings show that it is harder to pump than a 5w (assuming -5 degrees doubles the rating, then its practically the same as the 10w's pumpability).
Also, I wonder what the cold cranking rating is for the German Syntec 0w30?
crank-cranking viscosity Cp pump-pumping viscosity cP
d1
5w40 crank 3200@-25° pump 20500@-35°
m1
10w30 crank 3848@-25° pump 10250@-30°
5w30 crank 3600@-30° pump 12700@-35°
0w30 crank 3800@-35° pump 16250@-40°
0w40 crank 4301@-35° pump 21700@-40°
I don't blame the 40w for the higher CCS, because you can see the 0w40 is not much higher than the 0w30.
Maybe its because Delvac 1 is not as friction modified, but then, the cold pumping ratings show that it is harder to pump than a 5w (assuming -5 degrees doubles the rating, then its practically the same as the 10w's pumpability).
Also, I wonder what the cold cranking rating is for the German Syntec 0w30?
crank-cranking viscosity Cp pump-pumping viscosity cP
d1
5w40 crank 3200@-25° pump 20500@-35°
m1
10w30 crank 3848@-25° pump 10250@-30°
5w30 crank 3600@-30° pump 12700@-35°
0w30 crank 3800@-35° pump 16250@-40°
0w40 crank 4301@-35° pump 21700@-40°