Myths
Some of the most repeated advice about engine oil is wrong. The 3,000-mile oil change. Synthetic oil causes leaks. You can’t switch back to conventional once you’ve run synthetic. These persist because they sound plausible and nobody bothers to check. This section works through the claims that keep costing people money and equipment life.
Do Synthetic Oils Cause Engine Leaks? | The Real Answer
Do Synthetic Oils Cause Engine Oil Leaks? Short answer: No....
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What myths are covered in this section?
Whether synthetic oil causes engine leaks (it doesn’t — it reveals pre-existing leaks that conventional oil masked with deposits), and the oil filter bypass valve myth — the claim that bypass valves allow unfiltered oil to circulate through the engine during normal operation.
How does this category relate to other lubrication topics?
Most oil myths persist because people don’t understand base oil chemistry, additive function, or how engine seals actually degrade. The Base Oils and Additives sections cover the chemistry behind why the myths are wrong.
How do I request an article?
Use the contact page. If you’ve heard a claim about oil that doesn’t seem right, send it in. Priority goes to myths that are actively causing equipment damage or unnecessary maintenance expense.
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