I am looking at a few different oils for my road car (Renault Clio Sport - which I don't believe are sold in the USA)
There are three oils that I am interested in
Elf 5w-40 Exillium
Castrol 0w-40 The Edge
*Note : all of these many be marketed differently in various countries.
What I am trying to understand is that when I compare various technical datasheet values what am I looking for? higher / lower value? and how does the rating work - linear? or exponentially / or inverse exponentially.
Vis @ 100c cSt
Redline = 15.1
Castol = 13.5
Elf = 14.3
Is castrol's better then Redline? with the 1.6 point different, does that mean one is better then the other by 11%? or is the different not linear?
Redline = 170
Elf = 160
Castrol = N/a (no value given)
What does this mean? I know that Amsoil 5w.40 has a viscosity index of 182. is 22 points higher then Elf THAT much better?
High Temp High Shear Viscosity
Redline = 4.6
Castrol = 3.7
Elf = Not provided
To me, a 0.9 spread for such low values is alarming.. or is it a log curve?
Anything anyone can help me understand each value would be great!