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Message: <blockquote data-quote="billiards" data-source="post: 123659" data-attributes="member: 22610">having been in the lube and fuel business for many years...my  answer goes like this .....oil in the engine is needed to keep two medals from touching each other, many factors become involved as the engine runs that can make a difference to this one problem additives are put into the oil like warriors against the enemy.....but the very first hurdle is for the oil is to get to the points of contact.....that is done by oil viscosity, the temperature is the enemy, thick oil cannot get to the battle field.in answer to your question, the correct oil as to the viscosity  the mfg. recommendation in the user manual (which should advise the user according to out side temp)......i didnt mean to post a book on this or be smart....your question is a very good question and most or some do not acknowledge the importance of mfg. rec.........thanks for asking ..jack</blockquote>