Single or Mono Grade oil (e.g. SAE 40w)…

This is an oil which is only suitable for use within a very narrow temperature range.
SAE monograde oils usually fall into 2 main categories. The grades with a ‘w’ after them (SAE 5w, 10w, 15w and 20w) are only suitable for use in winter time because they are generally thin oils which are good for use in winter or for cold starting. Continue reading →