Really, the universal average oil ? Try averaging the grades here... https:/
Originally Posted by jongies3
Unless you're running an air cooled v-twin motorcycle or old VW Bug in hot weather and traffic, a 50wt isn't necessary for a liquid cooled car engine, they'll never get hot enough to need the extra protection from thermal breakdown. 30wt is the universal average and most widely used viscosity to date for good reason, it offers good protection across a range of temperatures and is easy to come by. Try finding a 5W-50 at any parts store!