Most oils will mix perfectly, provided they have a similar synthetic. Therefore, there is no problem in mixing 10w30 and 5w30 since one will be topping up. Mixing the viscosity of oils will not have any effect on the engine. 5w30 and 10w30 engine oils have close viscosity, and thus there is no harm in mixing them.
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Can I use 10w40 instead of 10W30? There’s not much difference between 10W-30 and 10W-40 motor oil. What sets them apart has more to do with temperature fluctuations and engine load. For moderate weather, either engine oil grades should work fine.
Similarly, Can you use 15w40 instead of 5W-30?
Using 15w40 instead of 5w30 will increase your fuel consumption because of more load on your engine’s crank. No it won’t blow off,you will just wear your engine out quicker because the oil won’t flow to the moving parts as quickly !
Can you put 10w40 in a 5W-30 engine?
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.
Is Full synthetic oil Better? Is synthetic oil better for my engine than conventional oil? Yes, synthetic oil is better for your engine than conventional oil. Although conventional oil (i.e., mineral oil) can provide adequate lubrication performance, it can’t compete with the overall engine performance and protection provided by synthetics.
Can I put synthetic oil in my car after using regular oil?
Synthetic oils typically provide better protection than conventional oils, but switching back and forth between full synthetic and conventional oil will not damage the engine.
Does it matter if I use synthetic oil? Though synthetics generally hold up better for more miles, regular oil changes remain important, and you shouldn’t wait beyond the time interval recommended by the manufacturer—typically every six months or a year. Using synthetic in these situations will prolong your oil life and require fewer changes.
What is 10W-40 oil used for?
This oil weight is commonly used in diesel engines or in a smaller motorcycle engine too. The 10W-40 oil viscosity also often serves as an alternative for older engines with burning or oil leaking issues. Why is that? The 10W-40 engine oil has a thicker viscosity than, say, 10W-30 oil when the car engine is hot.
Which is heavier 10W30 or 10W40? 10W40 is “thicker” than 10W30 when the car is at running temperature. Some people might also refer to it as “heavier”. Neither of these terms is technically accurate, but they do help to visualize it. In reality, we would say that 10W40 is more viscous than 10W30.
Can I use 15W40 instead of 10W30? Always use the viscosity oil that’s recommended. Now sometimes they may indicate that if you live in a warm climate you can should use a 15w40 or if you are in a cold climate to go with a 10w30. The lower the numbers the thinner the oil.
Which is better 5w30 or 15w40? Probably not. 15w40 is usually used in diesel engines and has a much different additives profile. 5w30 is usually used in gasoline engines. Diesel oil is designed with high antiwear additives such a ZDDP.
Can I use 5w40 instead of 15w40?
YES. Lowering the first number gives you much faster oil circulation on every startup, and especially in the cold. So you engine will have lower wear on every start-up. And since it flattens the viscosity curve, in hotter areas, like turbos, a 5W-40 will have more viscosity than a 15W-40.
Is 15w40 thicker than 10W30?
Since 10W-30 is thinner than 15W-40, its film strength can be weaker and it can be more prone to oxidation. Therefore, high quality additives are needed to compensate for those weaknesses in order for 10W-30 to protect as well and last as long as 15W-40.
Is all 10W-40 oil the same? 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.
Why can’t you go back to regular oil after synthetic? Synthetic Motor Oil Myths
If there is a spot where oil could leak out in your engine, then synthetic oil is more likely to leak than conventional. However, synthetic oil would not cause the leak. You can’t switch back to conventional oil: Once you switch to synthetic, you are not bound to it forever.
How often should you change full synthetic oil?
It used to be normal to change the oil every 3,000 miles, but with modern lubricants most engines today have recommended oil change intervals of 5,000 to 7,500 miles. Moreover, if your car’s engine requires full-synthetic motor oil, it might go as far as 15,000 miles between services!
What are the disadvantages of synthetic oil?
| Advantages and Disadvantages of Synthetic Oil | |
|---|---|
| Advantages | Disadvantages |
| Resistant to oxidation and chemical degradation | More expensive |
| Withstands temperature extremes better (cold and hot) | Possible additive precipitation/separation |
| Flows better at cold temperatures | Slightly lower fuel economy at highway speed |
Can you switch back to regular oil after using synthetic?
You can’t switch back to conventional oil: Once you switch to synthetic, you are not bound to it forever. You can switch back to conventional oil if you choose to do so and your vehicle manufacturer doesn’t recommend otherwise.
Can you switch oil types? When it comes to doing oil changes, switching between synthetic and conventional oil is perfectly okay. Despite the oil myths, both oil types are compatible with each other – no engine flush needed. So, simply making the switch will not cause any damage to your engine nor impact your travels.
Can you mix different brands of 5W30 oil?
It is perfectly ok to mix them. You won’t get the maximum protection of the best of them, but all motor oils are compatible. Actually, every time you change brands you are mixing about 15–20% of the old oil with the new that you are using.
Can you switch back to conventional oil after using synthetic? Myth: Once you switch to synthetic oil, you can never switch back. This is one of the most persistent myths about synthetic oil—and completely untrue. You can switch back and forth at any time. In fact, synthetic blends are simply a mixture of synthetic and conventional oils.
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