Is 15w40 thicker than 10w30?

Because 10W-30 is thinner than 15W-40 oil, 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 a 10W-30 engine oil to protect as well and last as long as a 15W-40.

What oil is thicker 15w40 or 10W30?

While the viscosity of a heavy duty engine oil accounts for its contribution to fuel economy, it is the composition of the base oil and additives that protect your engine from wear, soot and acid. Since 10W-30 is thinner than 15W-40, its film strength can be weaker and it can be more prone to oxidation.

Can I use 15w40 instead of 10W30 in diesel engines?

Lower viscosity is easier to pump and to shear. This is why many heavy-duty oils are moving from the traditional 15W-40 to 10W-30. If the engine is designed and manufactured to use a 10W-30, it can improve fuel economy and power over using a 15W-40.

Is a 10 weight oil thicker than a 40 weight oil?

Although both 10W-30 and 10W-40 lubricants function the same during cold startups, one is slightly thicker than the other and would be less practical for certain high ambient temperatures.

Is 10W-40 better than 15w40?

A 10w40 oil will be thicker in the cold than 15w40 oil, but they will have the same viscosities at higher temperatures. So during the cold season 15w40 being the lighter weight engine may provide better fuel efficiency provided that the engine can sustain thinner and lighter oil.

On-Highway 10W-30 vs. 15W-40

When should I use 15w40 oil?

ADVANTAGE 15W-40 HEAVY DUTY DIESEL ENGINE OIL can be used with complete success in over-the-road diesel trucks, off-highway diesel equipment, farm tractors, and passenger cars and light trucks with diesel, turbo-charged diesel engines, or gasoline engines and is backward compatible with previous API Oil Categories.

Is 15w40 oil thicker than 30 weight?

Next, while hot, 15w40 will be thicker or have a higher viscosity than SAE 30. This is shown by the rating of 40 versus 30 between the two oils. When the engine is warmed up, SAE 30 will flow more easily than 15w40 would.

Is Thicker oil better for older engines?

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 a thicker oil than 10w30?

The quick answer is 10W40 is a thicker engine oil than 10W30 at higher temperatures. Both have almost the same characteristics, and the only difference is the oil viscosity.

Will thicker oil damage my engine?

Using oil that is thicker than recommended may lead to a decrease in fuel economy, a higher load on your engine, and even a shorter life for your engine. Conversely, using thinner, lighter-weight oil than recommended can cause excessive wear and shorter life.

Can I mix 15W 40 with 10W 30?

You can mix them with no problem. Read on the internet where a guy blow up his car doing that. you can mix the two without a problem, for Wisconsin, the 15w 40 would be a better oil in the summer and 10w 30 would be a better oil for the winter, if you drive the car in the winter!

Which engine oil viscosity is best?

The smaller the number, the better it will flow. A 5W-30 will flow easier than a 10W-30 at start-up temperatures and a 10W-30 will flow more easily than a 10W-40 at normal engine operating temperatures. Engine oil viscosity is important. Engine oils naturally thicken as they cool and thin as they are heated.

Why do diesels use thicker oil?

Higher the viscosity thicker the oil. It is believed that thick oils are better at maintaining film strength and oil pressure at high temperatures and loads. This oil is majorly made for the rare cars which are with diesel engines that burns oil excessively. It is a premium high performance mineral.

Can I use 15w50 instead of 10W30?

Neither, they both have a purpose and both correct and incorrect uses. One is not better than the other. One is more viscous than the other. 10/30 is thinner than 15/50.

What does 15W40 stand for?

The first number 15W is the viscosity of the oil at cold temperature, and the second number 40 is the viscosity at 100 °C. The 15W40 designation means that the oil is a multigrade oil. It has the viscosity of 15W when cold and the viscosity of SAE 40 when hot. This means that one type of oil works in all temperatures.

Can you use 15W40 oil in a gas engine?

Mobil Gas Engine Oil 15W-40 is a premium fleet engine oil specifically formulated to provide reliable protection for trucks and buses using Compressed Natural Gas (CNG) or Liquefied Natural Gas (LNG). Mobil Gas Engine Oil 15W-40 is formulated from high quality base stocks and a balanced additive system.

What's the thickest motor oil?

Importance of a Viscosity Scale

In order to have a standard way to measure the viscosity of engine oil, the Society of Automotive Engineers (SAE) developed a viscosity scale. The scale ranges from 0W, which is the thinnest type of oil, to a rating of 60, which is the thickest oil.

Is 10W-40 heavier than 10w30?

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.

Is 20w50 thicker than 10w30?

It really comes down to personal preference. As your engine does put out significant horsepower, we would lean toward using 20W-50. If your engine sees very light duty or is built exceptionally tight, 10W-30 would be fine. But again, if you twisted our arm, we would give 20W-50 the nod for the thicker viscosity.

Which oil is best for old engines?

What oil should I use for high mileage?

Some mechanics recommend switching to a thicker (higher viscosity) oil — such as 10W-30 full synthetic oil instead of 5W-20 full synthetic — or using oil additives to stop leaks.

Is 10w30 better for high mileage?

10W-30 motor oil makes for a decent high-mileage oil. It gives a better fuel economy while reducing the oil consumption for older engines. Older engines with more than 75,000 miles on them require a thicker oil that will properly lubricate their critical engine parts and prevent oil leaks, sludge, and deposits.

Can I mix 15W40 with SAE 30?

These two oils are completed mixable at any ratio.

Is 10w30 for diesel?

Mobil Delvac™ Extreme 10W-30 is a synthetic, high-performance diesel engine oil that helps extend engine life while providing long drain capability for modern diesel engines operating in extreme conditions.

Can you use 15W40 as hydraulic oil?

Mobil Agri Super™ 15W-40 is a high performance, multi-functional lubricant for most farm equipment applications. This STOU lubricant provides good performance in diesel and gasoline engines, transmissions, hydraulics, final drives and oil-immersed brakes operating in agricultural service.