Engine oil and filters may seem like a simple topic, but they concentrate mistakes that cost a lot — and some put safety at risk. For those just starting out, separating myth from truth avoids scares and hasty decisions.
The good news: with a few objective precautions, it’s possible to keep the basics up to date without improvisation. Below are the most common myths and what really matters.
Myth: thicker oil protects the engine better
Higher-viscosity oil is not synonymous with extra protection. Each engine is designed to work within a specific viscosity range. Outside it, lubrication may be delayed on cold starts or may not circulate as it should.
**Practical truth:** use the viscosity indicated in the owner’s manual. Switching to a “thicker” oil to hide noise or oil consumption usually makes the problem worse and increases wear.
Truth: driving with a low level is an immediate risk
There is no room for doubt here. A level below the minimum increases friction, temperature, and the chance of serious failure. In extreme cases, the engine can seize.
**How to check safely:** - Park on level ground. - Turn off the engine and wait a few minutes. - Use the dipstick; the level should be between minimum and maximum. - Top up gradually, without exceeding the maximum.
Myth: changing the oil “whenever possible” doesn’t hurt
Delaying the oil change is common, but dangerous. Oil ages, loses additives, and accumulates contaminants. Even if the car is driven little, time also counts.
**Practical truth:** follow the interval by mileage **or** time, whichever comes first. For those selling the car, an up-to-date service history builds trust and avoids questions.
Truth: the oil filter is a safety item
A saturated filter does not filter. In some situations, the internal valve opens and oil circulates without filtration to avoid loss of pressure — in other words, dirt in the engine.
**Simple rule:** changed the oil, change the filter. Saving money here is false economy.
And the other filters?
- **Air filter:** influences fuel consumption and performance. Too dirty, it can cause misfires and hesitation. - **Fuel filter:** protects injectors and the fuel pump. When clogged, it strains the system and can cause power loss.
Myth: very dark oil means a problem
Oil darkens because it is cleaning the engine and suspending impurities. This is expected.
**Practical truth:** color alone does not define condition. What matters is the usage interval, the correct level, and the proper specification.
Truth: working on the engine when it’s hot is dangerous
Opening the hood right after turning off the car exposes you to burns. Oil and components are at high temperature.
**Basic care:** wait for it to cool before checking the level, topping up oil, or touching filters. Safety comes before haste.
Myth: miracle additives replace maintenance
Promises to “restore” an engine with magic bottles are common. Some products may even clean, others just mask symptoms.
**Practical truth:** no additive makes up for the wrong oil, an old filter, or a delayed oil change. In cars for sale, excessive use of additives often raises suspicions.
Truth: simple maintenance helps with selling
When oil and filters are up to date, the car runs better, makes less noise, and inspires more confidence in a basic inspection.
**Before listing:** - Recent oil and filter change, with the correct specification. - Level checked and no apparent leaks. - Clean air filter.
These precautions don’t transform the car, but they avoid difficult questions and show that basic maintenance has been respected — an important sign for buyers.
Separating myth from truth about oil and filters is a simple step toward driving more safely and negotiating better. The basics done right are still what best protect the engine — and your wallet.
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