Quick Answer: Which Number Is The Weight In Oil?

What do oil weight numbers mean?

The “w” in motor oil stands for winter.

For example, a 5W- motor oil will flow better at lower temperatures than a 15W- motor oil.

The higher number, following the “w” refers to hot weather viscosity, or how fluid your oil is at hot temperatures.

The higher the number, the thicker the oil at a specified temperature..

How do you know the weight of oil?

The owner’s manual for your car will list its recommended oil weight, whether that’s a standard format like 10W-30 or something more unusual. That number refers to the viscosity (or thickness) of the oil that you should use.

Which one is thicker 5w30 or 10w30?

10w30 is thicker then 5w30 because it has a higher viscosity in low temperatures. The engine oil will flow slower than 5w30 during the cold season. Thicker or higher viscosity metal oil has a better seal compared to low viscosity oil.

Is SAE 30 the same as 10w30?

Nope. SAE 10W30 is an oil that has SAE 10W viscosity(thickness) at low temperatures, and SAE 30 viscosity at high temperatures. SAE 10W30 is an oil that has SAE 10W viscosity(thickness) at low temperatures, and SAE 30 viscosity at high temperatures. The W stands for ‘Winter’.

Can I use 5w30 in hot weather?

The ambient temperature makes very little difference any more, except maybe in the low end of the spec. (0W-30 in super cold, while 5W-30 in hot weather).

What is the first number in oil mean?

The first number describes viscosity at low temperatures. The second number refers to viscosity at normal engine operating temperatures. Some examples: the “5” in a 5W-30 motor oil will protect an engine down to an air temperature of about -25 degrees Fahrenheit.

What happens if I use 10w40 instead of 10w30?

You can still use 10w30 engine oil, but it dilutes much faster and damages the internal components of the engine. The 10w40 engine oil will do a much better job by providing sufficient lubrication and protecting the metal components.

Which oil is thicker 5w30 or 10w40?

A 10w-40 motor oil is a thicker oil at startup than a 5w-30 motor oil. Therefore, 10w-40 oil clings to the engine’s moving parts more than the lower viscosity 5w-30 oil.

What does SAE 30 oil mean?

SAE 30 is a typical single-grade rating. That means that an organization called the Society of Automotive Engineers (SAE) ran the oil through a standardized tube-like device and timed how long it took, in seconds, to flow from one end to the other.

Is Thicker oil better for high mileage cars?

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.

What is equivalent to SAE 30 oil?

SAE 10W is equivalent to ISO 32, SAE 20 is equivalent to ISO 46 and 68, and SAE 30 is equivalent to ISO 100. As you can see, there is a bit of a difference between ISO 68 and SAE 30. The viscosity of the fluid largely determines the oil temperatures within which the hydraulic system can safely operate.

Can I mix 5w30 and 10w30?

Mixing different oils will not improve the performance or efficiency of the engine in any way. The additives in synthetic oil may have limited or no effect at all when mixed with a regular engine oil. … 5w30 and 10w30 are both 30 weight oils and the exact same thickness in your engine when it is at operating temperature.

What is the difference between 10w 40 and 10w 30?

The viscosity of hot oil is measured using different test parameters than when the oil is cold, so the numbers after the “W” don’t relate to the numbers in front of the “W”. 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.

Should I use thicker oil in summer?

As a general rule, you’ll get the best protection in the summer when you use a slightly thicker grade of oil, such as a 10W30 instead of a 5W30. Engines need a thicker oil in the summer months because of the summer heat and its effects on thinning the oil out.

Is it OK to use 10w30 instead of SAE 30?

It is pefectly fine to use SAE 30 oil in place ofthe 10W30, as long as you never let the oil get belowdegrees 50C. (100 degree c measured), so when your car isrunning at normal temperature the oil flows properly.

Can you mix synthetic and regular oil?

Yes, you can safely mix synthetic and conventional oil. All motor oil, whether synthetic or conventional, is a combination of base oils and additives. … In the end, conventional and synthetic oils are completely compatible.

What is SAE 30 motor oil used for?

Use. SAE 30 oil is typically used for smaller air-cooled engines, like the ones in small tractors, lawnmowers, and chain saws. Most motor oils today are multi-grade oils that will perform well in all seasons.

Can I use 5w30 instead of SAE 30?

5w-30 is fine to use. It has the same flow rate as SAE30 at normal operating temps. The way oil works is, the first number is flow rate at ambient temp. The second number is flow rate at operating temp of the engine.

What is the thickest oil?

The SAE grades go from the extremely thin Winter 0W through to 70, (for different flows at 100°C for the non-W range). 60 is the thickest oil in general use, but there are racing grades that go to 70. Most lubricating oils are now multigrade.

Can I use 10w40 instead of 5w30?

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.

How do you read oil numbers?

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.