Oil recommendation for my 1970 dodge dart with 318 engine
Some people like graphs.
Viscosity is measured in Stokes or centiStokes (metric).
This is a graph of viscosity vs. temprature for three of the grades mentioned above. Additionally shown is 5W-20.
Viscosity specs for all are Havoline conventional so we're not mixing different product lines.
from the graph we can see the 10W-40 around 240*F would have the same viscosity as the 10W-30 a bit over 212*F.
Oil in the pan on a warmed up engine should be 180*F and typically won't be much above 220*F but it depends on engine and conditions.
Some people like graphs.
Viscosity is measured in Stokes or centiStokes (metric).
This is a graph of viscosity vs. temprature for three of the grades mentioned above. Additionally shown is 5W-20.
Viscosity specs for all are Havoline conventional so we're not mixing different product lines.
from the graph we can see the 10W-40 around 240*F would have the same viscosity as the 10W-30 a bit over 212*F.
Oil in the pan on a warmed up engine should be 180*F and typically won't be much above 220*F but it depends on engine and conditions.
