ONLY if it is a synthetic; for a non-synthetic it is the wrong solution! You are looking for trouble in a hot engine with a super wide range viscosity non-synthetic oil; as YR referred to, there are viscosity improvers added into wide viscosity standard oils, that are absolutely needed to make this wide range in a non-synthetic. Viscosity improvers are a long time KNOWN problem when temps get up; they break down and gum things up. Sticking piston rings became a very common problem when large amounts of VI's were added; this was becoming well known in the 1970's by the oil and engine manufacturers.
