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Motor Oil Myths & FAQs - Synthetic vs Conventional


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 conventiona


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