What engine oil grade should I use?
The smaller the number, the better it will flow. So a 5W-30 will flow easier than a 10W-30 at start-up temperatures and a 10W-30 will flow easier than a 10W-40 at normal engine operating temperatures. This is important, as engine oils naturally thicken as they cool and thin as they are heated.
Is Thicker oil better for older engines?
Older engines use more oil, but it gives them a better fuel economy. Older engines with more than 75,000 miles on them require a thicker oil that will lubricate their critical engine parts and prevent oil leaks, sludge, and deposits from forming.
What is better 10w40 or 5w30?
5w30 oil is especially well suited to vehicles operating in cold climates. 5W-30 motor oil is mainly of cold-weather viscosity quality.
Comparison Table Between 5w30 and 10w40.
| Parameters of Comparison | 5w30 | 10w40 |
|---|---|---|
| Thickness | 5w30 oil is thinner than 10w40 oil. | 10w40 oil is thicker than 5w30 oil. |
Which is better 10w40 or 20W40?
Which Oil Is Better 10w40 Or 20w40? There is only one difference between 10W40 and 20W40 oils, which is that they have a higher ‘W’ number, which means they won’t perform well in colder temperatures.
Can I use 10w40 instead of 5w30?
Your vehicle does not use 5W-30 oil. The recommended oil viscosity for your vehicle, according to Kia documentation, is 10W-40. If you drive the vehicle in exceptionally cold weather, well below 32 degrees, you can use 5W-30 oil but even 10W-40 is still perfectly OK to use if outdoor temperatures are below freezing.
When should I use 20W50 oil?
20W50 motor oil is suitable for warmer climates, where the higher temperature causes the oil to thin. It is also useful for vehicles subject to hot temperatures and for those used for high-stress activities such as hauling or pulling trailers.
Is 10W40 good for summer?
They are both available in pure conventional form or as high-quality synthetic grades. Either 10W30 or 10W40 for summer use is fine; however, 10W-40 motor oil will better protect your engine.