Rolla07 said:In the USA deviating from the viscosity in the OM is a felony.
That is because we have a federal agency called the EPA, and another called the TSA which are tasked with keeping us and the Earth healthy and happy, and protecting us from oil of an unsafe viscosity. They have expensive computer models that tell them what viscosity oil is safe (from a health/happy stand point) to use in a particular engine. Using an unapproved oil may be considered a crime against humanity.