If you are racking your brain to choose between 5w30 and 5w40, we recommend you go with 5w30. However, if it is too expensive or not available for use, you can always go with the 5w40, which is just as good and will not cause any damage to the engine parts..
In this regard, which oil is better 5w30 or 5w40?
In fact, the only major difference between 5w30 and 5w40 is the viscosity in warmer temperatures. This makes the 5w30 better suited for colder temperatures and the 5w40 better suited for warmer ones.
Additionally, what oil can I use instead of 5w40? Best to use a 5w40. There are plenty around. Even using a heavy duty diesel oil, ie Mobil 1 Turbo Diesel Truck 5w40 (or for slightly less money, Shell Rotella T-synthetic 5w-40) will be good.
In this manner, why is 5w30 more expensive than 5w40?
Most enthusiasts will agree that 5W30 is the better due to it versatile application and better performance. However, it does usually come with a higher price tag than the alternative. If you drive a higher mileage vehicle or noticing high oil consumption, the 5W40 may be the better choice of the two different oils.
What does 5w 40 oil mean?
Answered Mar 19, 2017. In a 5w-40 for example the 5w bit (W = winter, not weight or watt or anything else for that matter) simply means that the oil must have a certain maximum viscosity/flow at low temperature. The lower the "W" number the better the oil's cold temperature/cold start performance.
Related Question Answers
What oil is thicker 5w30 or 10w40?
5w30 is less viscous while 10w40 is more viscous. The 5w30 has a viscosity of 30 at high temperature while a 10w40 has a 40 viscosity at high temperatures. When at high temperatures, the 5w30 oil becomes thinner than the 10w40 oil since 30 is lower as compared to 40.Is 5w40 oil thicker than 5w30?
Viscosity That means 5w40 has larger viscosity than 5w30. So, 5w30 is better than 5w40.Is 5w40 good for winter?
5w30 can be used by different type of vehicles and in different range of temperatures, but is ideal for colder temperatures. 5w40 is often used in higher mileage engine sand performs better in warmer temperatures.Is 5w30 good for old cars?
So yes as long as you have good oil presure with 5W30 you can run it with no problems.Is 5w40 good for summer?
Be happy; 5W40 is great for summer with the added bennie of great cold start specs. As to interval, you can safely go longer but how much longer will depend on the soot load and fuel dilution.Should I use thicker oil in a high mileage engine?
A: Yes. This is a practical method to improve oil pressure in an older, high-mileage engine. The slightly thicker oil film from the heavier base weight oil — 10W — can help protect worn engine bearings as well. The engine does not leak and I've never seen a whiff of blue smoke.Can you get sludge with synthetic oil?
Synthetic motor oil will not thicken during cold temperatures which will make engine starting and oil pressure buildup better. Synthetic motor oil does not evaporate as quickly. At this high temperature oxidation can occur which will develop deposits and varnish. These also can cause sludge.What is the difference between 5w30 and 15w40 engine oil?
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. Gasoline oil doesn't have the antiwear additives diesel oil does, leading to faster wear on your engine.What is 5w 30 synthetic oil?
Mobil 5W-30 oils 5W-30 oil is a common motor oil viscosity that's recommended by many auto manufacturers for use in all types of modern vehicles - passenger cars, SUVs, light vans and trucks - including high-performance turbo-charged and supercharged engines.Is 5w30 good for summer?
5w30 is a great multigrade oil for use in low starting temperatures as well as high summer temperatures. It is also more fuel efficient since it creates less drag on the bearings and moving engine parts. 10w30 is thicker and may provide better sealing capability for older engines.Can you 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.What does 5w30 mean?
In a 5W-30 for example, the number before the W describes the viscosity of the oil at low temperatures. The lower the number, the thinner the oil and the better the oil's cold temperature/ cold start performance. The number after the W describes how thick the oil is at the engine's normal operating temperature.What is 5w30 oil used for?
Uses of 5w30 5w30 is used in light-duty diesel engines, light-duty petrol engines, and automotive gasoline engines. 5w30 engine oil is preferred for engines working in cold climates, as it gives good flow at lower temperatures.Can I use 5w40 instead of 10w40?
10w40 is thicker than 5w40, ONLY when cold. At operating temperature it is exactly the same. Multi-viscosity oils with a lower W number are specifically designed to flow better, and thus lubricate better, at very low temperatures. There is no need to use a 5w-40 if the vehicle only requires 10w-40.How many miles can you drive on 5w30?
(6000 miles compared to 3000 miles) Although if you baby your car or have a high performance car you should still change it between 3000-3500 miles even if it is synthetic. I use Mobil 1 5w-30 and change it religiously right after 3000 miles.What is the correct engine oil for my car?
A 5W oil is typically what's recommended for winter use. However, synthetic oils can be formulated to flow even more easily when cold, so they are able to pass tests that meet the 0W rating.When should I use 10w40 oil?
Using 10w30 oil in cold weather will help reduce excessive oil temperatures and drag as the engine warms up. Using 10w40 oil in the summer will help the oil stick to internal components in high temperatures, avoiding the wear and tear from metal-to-metal contact between moving parts.What is the difference between 5w40 and 10w40 engine oil?
What is the Difference Between 5w40 and 10w40? The difference between the two is that the 10w40 tends to be thicker than the 10w40 when cold. However, they both operate at the same viscosity at higher temperature. If the vehicle needs a 10w40, then it is best to use this specification and not a 5w40.Is 10w 40 too thick?
Multi-grade oils could stay as close to the optimum viscosity over a range of temperatures – not too thick when it is cold and not too thin when it is hot. The difference between 10W-30 and a 10W-40 is the high temperature viscosity. Obviously, a 10W-40 is thicker than a 10W-30 at high temperature. 
