Choosing the best, whether synthetic or conventional, engine oil is highly controversial and debated. Motor oil is surrounded with myths and questions. Shell helps answer the following: - What does 5W-30 mean? - Why should I change my oil? - What is the typical composition of motor oil? - Are aftermarket oil additives needed? - What does synthetic oil mean? - Can you mix synthetic with conventional oil? - Can synthetic be used to break in an engine? - What causes sludge? - Why should I use the viscosity grade that the manufacturer recommends? Related Videos: Trackside Lab Formula 1 - http://youtu.be/6G8XP8L-MFE Shell Technology Center - http://youtu.be/pUr7-Ug1Uqc Please feel free to rate, comment, and subscribe! And don't forget to check out my Facebook page: http://www.facebook.com/engineeringexplained To help create more videos, check out my Patreon page! http://www.patreon.com/engineeringexplained Also check out my official website: Make suggestions, participate in forums, learn through logically ordered lessons, read FAQs, and plan your future! http://www.howdoesacarwork.com Now on Twitter: http://www.twitter.com/jasonfenske13 NEW VIDEO EVERY WEDNESDAY!