Motorolje SAE multigrade viskositet

Which is the best grade oil for use in my motor?

Put that question to a group of “knowledgeable” motor heads and the fur will fly. Pronouncements of doom and dire consequences will abound, usually supported by half truths, urban myths, and anecdotal experiences giving rise to a general atmosphere of fear, uncertainty, and doubt (FUD).

A good understanding of the information presented above will help dispel much of that FUD and aid you in making a well informed choice. In general you are best served to simply follow the recommendations of the engine manufacturer. But there are times when that may not be practical or wise.

The manufacturer’s recommendation is based on the assumption that the motor is in new or close to new condition and is being operated in a typical environment. It is also based on the SAE standards in effect at the time the recommendation is issued. As we’ve seen the SAE standard has changed tremendously over the last 100 years and tremendous advances in motor oil performance have been realized.

So a 50 or even 25 year old grade recommendation might not be the best choice given current standards and/or oils. And if your motor is badly worn or operated in unusually harsh or demanding environments that may alter the grade requirements as well.