tikal
Veteran Member
Oil viscosity vs temperature
I think if a 0W-30 507 oil was available in North America the difference would be even more noticeable.
If I go to this tool http://www.widman.biz/English/Calculators/Graph.html and graph the oil I am currently using (Schaeffer 9000 5W-40) vs Liqui Moly Top Tec 4200 5W-30 (507 approved) I see that at 0 C there is a substantial difference in viscosity (approx. 720 vs 550 CSt). On the other side the viscosity differences at hot temperatures (around 100 C) are much less pronounced.Why would you assume that 5W-30 is somehow lighter at cold temperatures than 5W-40? The 5W is the cold viscosity. The 30/40 are the hot viscosities. The cold viscosities look the same to me.
I think if a 0W-30 507 oil was available in North America the difference would be even more noticeable.