Originally Posted By: jstutz
that does not take into account the basestock that was used so it really is not a real compairison
I asked Widman in a PM about the accuracy in using his viscosity chart when extrapolating to extreme temp's and the following was his response:
" The PP depressants are the main factors that distort it, so the farther you go below around 10F (-12C), the more it will vary, with the synthetics staying pretty much inline and the cheaper base oils with more PP depressants will thicken up more"
that does not take into account the basestock that was used so it really is not a real compairison
I asked Widman in a PM about the accuracy in using his viscosity chart when extrapolating to extreme temp's and the following was his response:
" The PP depressants are the main factors that distort it, so the farther you go below around 10F (-12C), the more it will vary, with the synthetics staying pretty much inline and the cheaper base oils with more PP depressants will thicken up more"
