One of the most confusing topics when choosing engine oil is the difference between 5W40 and 10W40. Both are multigrade oils, and while the only difference may seem to be a single digit, this difference directly affects your vehicle's cold weather starting performance. In this article, we clearly explain the technical difference between the two and in which situations each should be preferred.
| Feature | Motul 5W40 | Motul 10W40 |
|---|---|---|
| Cold weather fluidity | Better (easy starting down to -30°C) | Good (around -25°C) |
| Tolerance in high-mileage engines | Standard | More tolerant (slightly "thicker" consistency) |
| Vehicles typically suitable for | Newer models, engines requiring low viscosity | Mid-to-older models, high mileage engines |
| Effect on fuel consumption | Slightly advantageous | Neutral |
| Price | Generally a bit higher | Standard |
If your vehicle manufacturer recommends 5W40 or if it is frequently started in very cold weather (e.g., -20°C and below in winter months), 5W40 offers better cold starting performance. How quickly the oil reaches critical parts during initial startup is of great importance for engine life.
If your vehicle has accumulated high mileage or the manufacturer directly recommends 10W40, this oil provides slightly more "robust" protection against potential oil pressure drops that may occur as internal engine tolerances increase over time. In temperate climates (such as the Aegean and Mediterranean regions), where winter severity is less pronounced, 10W40 can be comfortably preferred.
Both oils are high quality and reliable; the main determining factor is the viscosity value recommended by the manufacturer. The healthiest approach is to follow the value specified in your vehicle's owner's manual or on the oil cap. If you are unsure, you can contact us with your license plate or engine code, and we can confirm the correct product together.
Will using 10W40 instead of 5W40 damage the engine?
No, it will not damage the engine. However, in very cold weather, the time it takes for the oil to reach metal surfaces during the initial startup may be slightly longer.
Can I switch from 10W40 to 5W40?
Yes, if it's within the manufacturer's recommended range, you can switch. It's sufficient to completely drain the old oil during the oil change.
Is Motul 5W40 fully synthetic?
Motul's 5W40 line includes both synthetic technology and fully synthetic options; you should check the product label.
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View Motul 5W40 product page → | View Motul 10W40 product page →
